| Common Name | Scientific Name | Code |
| n/a | Ahtiana aurescens (Tuck.) Thell & Randlane | AHAU |
| n/a | Ahtiana pallidula (Tuck. ex Riddle) Goward & Thell | AHPA |
| n/a | Allantoparmelia siberica (Zahlbr.) Essl. | ALSI7 |
| n/a | Allocetraria Kurokawa & Lai | ALLOC |
| n/a | Allocetraria oaksiana (Tuck.) Randlane & Thell | ALOA |
| n/a | Arctocetraria andrejevii (Oksner) Karnefelt & Thell | ARAN18 |
| n/a | Arctocetraria Karnefelt & Thell | ARCTO10 |
| n/a | Arctocetraria nigricascens (Nyl.) Karnefelt & Thell | ARNI2 |
| n/a | Bryoria glabra (Mot.) Brodo & D. Hawksw. | BRGL3 |
| n/a | Cetraria aculeata (Schreber) Fr. | CEAC3 |
| n/a | Cetraria islandica (L.) Ach. ssp. islandica | CEISI |
| n/a | Cetraria muricata (Ach.) Eckfeldt | CEMU4 |
| n/a | Cetrariella delisei (Bory ex Schaerer) Karnefelt & Thell | CEDE13 |
| n/a | Cetrariella fastigiata (Delise ex Nyl.) Karnefelt & Thell | CEFA5 |
| n/a | Cetrariella Karnefelt & Thell | CETRA3 |
| n/a | Flavocetraria cucullata (Bellardi) Karnefelt & Thell | FLCU |
| n/a | Flavocetraria Karnefelt & Thell | FLAVO3 |
| n/a | Flavocetraria nivalis (L.) Karnefelt & Thell | FLNI |
| n/a | Hypogymnia apinnata Goward & McCune | HYAP3 |
| n/a | Hypogymnia subphysodes (Krempelh.) Filson | HYSU10 |
| n/a | Hypotrachyna costaricensis (Nyl.) Hale | HYCO16 |
| n/a | Hypotrachyna riparia McCune | HYRI4 |
| n/a | Hypotrachyna taylorensis (M. E. Mitch.) Hale | HYTA4 |
| n/a | Kaernefeltia californica (Tuck.) Thell & Goward | KACA4 |
| n/a | Kaernefeltia merrillii (Du Rietz) Thell & Goward | KAME |
| n/a | Kaernefeltia Thell & Goward | KAERN |
| n/a | Melanelia agnata (Nyl.) Thell | MEAG |
| n/a | Melanelia commixta (Nyl.) Thell | MECO18 |
| n/a | Melanelia culbersonii (Hale) Thell | MECU5 |
| n/a | Melanelia hepatizon (Ach.) Thell | MEHE6 |
| n/a | Melanelia tominii (Oksner) Essl. | METO8 |
| n/a | Nodobryoria abbreviata (Mull. Arg.) Common & Brodo | NOAB |
| n/a | Nodobryoria Common & Brodo | NODOB |
| n/a | Nodobryoria oregana (Tuck.) Common & Brodo | NOOR3 |
| n/a | Nodobryoria subdivergens (E. Dahl) Common & Brodo | NOSU2 |
| n/a | Parmelia pseudosulcata Gyelnik | PAPS8 |
| n/a | Parmelinopsis cryptochlora (Vainio) Elix & Hale | PACR17 |
| n/a | Parmotrema gardneri (Dodge) Serus. | PAGA4 |
| n/a | Parmotrema rubifaciens (Hale) Hale | PARU9 |
| n/a | Punctelia Krog | PUNCT |
| n/a | Punctelia punctilla (Hale) Krog | PUPU2 |
| n/a | Rimeliella conferenda (Hale) Kurok. | RICO15 |
| n/a | Rimeliella Kurok. | RIMEL3 |
| n/a | Rimeliella neotropica (Kurok.) Kurok. | RINE3 |
| n/a | Rimeliella subsumpta (Nyl.) Kurok. | RISU8 |
| n/a | Rimeliella subtinctoria (Zahlbr.) Kurok. | RISU9 |
| n/a | Tuckermannopsis inermis (Nyl.) Karnefelt | TUIN |
| n/a | Tuckermannopsis subalpina (Imshaug) Karnefelt | TUSU |
| n/a | Tuckermannopsis weberi (Essl.) | TUWE |
| n/a | Usnea amblyoclada (Mull. Arg.) Zahlbr. | USAM2 |
| n/a | Usnea ammannii P. Clerc & Herrera-Campos | USAM3 |
| n/a | Usnea chaetophora Stirton | USCH |
| n/a | Usnea dasaea Stirton | USDA2 |
| n/a | Usnea esperantiana Clerc | USES2 |
| n/a | Usnea halei P. Clerc | USHA |
| n/a | Usnea madierensis Mot. | USMA |
| n/a | Usnea nashii P. Clerc & Herrera-Campos | USNA |
| n/a | Usnea nidulans Mot. | USNI |
| n/a | Usnea pacificana Halonen | USPA2 |
| n/a | Usnea perplectata Mot. | USPE3 |
| n/a | Usnea silvatica Mot. | USSI2 |
| n/a | Usnea subcariosa Mot. | USSU7 |
| n/a | Usnea wasmuthii Rasanen | USWA |
| n/a | Vulpicida canadensis (Rasanen) J.-E. Mattsson & M. J. Lai | VUCA |
| n/a | Vulpicida J.-E. Mattsson & M. J. Lai | VULPI2 |
| n/a | Vulpicida pinastri (Scop.) J.-E. Mattsson & M. J. Lai | VUPI |
| n/a | Vulpicida tilesii (Ach.) J.-E. Mattsson & M. J. Lai | VUTI |
| n/a | Vulpicida viridis (Schwein.) J.-E. Mattsson & M. J. Lai | VUVI |
| Ahti's neofuscelia lichen | Neofuscelia ahtii (Essl.) Essl. | NEAH |
| Ahtiana aurescens | Cetraria aurecscens Tuck. [orthographic error] | CEAU6 |
| Ahtiana aurescens | Cetraria aurescens Tuck. | CEAU9 |
| Ahtiana aurescens | Tuckermannopsis aurescens (Tuck.) Hale | TUAU |
| ahtiana lichen | Ahtiana Goward | AHTIA |
| ahtiana lichen | Ahtiana sphaerosporella (Mull. Arg.) Goward | AHSP |
| Ahtiana pallidula | Cetraria pallidula Tuck. ex Riddle | CEPA16 |
| Ahtiana pallidula | Tuckermannopsis pallidula (Tuck. ex Riddle) Hale | TUPA3 |
| Ahtiana sphaerosporella | Parmelia sphaerosporella Mull. Arg. | PASP12 |
| Ajo xanthoparmelia lichen | Xanthoparmelia ajoensis (T. Nash) Egan | XAAJ |
| Alabama paraparmelia lichen | Paraparmelia alabamensis (Hale & McCull.) Elix & J. Johnston | PAAL21 |
| Alaskan giant shield lichen | Cetrelia alaskana (C. Culb. & Culb.) Culb. & C. Culb. | CEAL9 |
| Alberta melanelia lichen | Melanelia albertana (Ahti) Essl. | MEAL8 |
| Allantoparmelia almquistii | Parmelia almquistii Vainio | PAAL24 |
| Allantoparmelia alpicola | Parmelia alpicola Th. Fr. | PAAL25 |
| allantoparmelia lichen | Allantoparmelia (Vainio) Essl. | ALLAN2 |
| allantoparmelia lichen | Allantoparmelia alpicola (Th. Fr.) Essl. | ALAL61 |
| Allantoparmelia siberica | Parmelia siberica Zahlbr. | PASI7 |
| Allocetraria oaksiana | Cetraria oakesiana Tuck. | CEOA |
| Allocetraria oaksiana | Tuckermannopsis oakesiana (Tuck.) Hale | TUOA |
| Almquist's allantoparmelia lichen | Allantoparmelia almquistii (Vainio) Essl. | ALAL60 |
| alpine beard lichen | Usnea alpina Mot. | USAL |
| Amazon canoparmelia lichen | Canoparmelia amazonica (Nyl.) Elix & Hale | CAAM26 |
| ambiguous bran lichen | Parmeliopsis ambigua (Wulfen) Nyl. | PAAM60 |
| American anzia lichen | Anzia americana Yoshim. & Sharp | ANAM6 |
| American horsehair lichen | Bryoria trichodes (Michaux) Brodo & D. Hawksw. ssp. americana (Mot.) Brodo & D. Hawksw. | BRTRA |
| American tuckermannopsis lichen | Tuckermannopsis americana (Sprengel) Hale | TUAM |
| Antilles parmotremopsis | Parmotremopsis antillensis (Nyl.) Elix & Hale | PAAN11 |
| anzia lichen | Anzia colpodes (Ach.) Stizenb. | ANCO25 |
| anzia lichen | Anzia Stizenb. | ANZIA |
| Appalachian punctelia | Punctelia appalachensis (Culb.) Krog | PUAP |
| arctic brodoa lichen | Brodoa oroarctica (Krog) Goward | BROR60 |
| arctic dactylina lichen | Dactylina arctica (Richardson) Nyl. | DAAR60 |
| Arctocetraria andrejevii | Cetraria andrejevii Oksner | CEAN60 |
| Arctocetraria andrejevii | Cetraria simmonsii Krog | CESI7 |
| Arctocetraria nigricascens | Cetraria elenkinii Krog | CEEL60 |
| Arctocetraria nigricascens | Cetraria nigricascens (Nyl.) Elenkin | CENI61 |
| Arctocetraria nigricascens | Cetraria siberica H. Magn. | CESI6 |
| Arctoparmelia centrifuga | Arctoparmelia aleuritica (Nyl.) Hale | ARAL25 |
| Arctoparmelia centrifuga | Parmelia aleuritica Nyl. | PAAL29 |
| Arctoparmelia centrifuga | Parmelia centrifuga (L.) Ach. | PACE5 |
| Arctoparmelia centrifuga | Xanthoparmelia centrifuga (L.) Hale | XACE3 |
| Arctoparmelia incurva | Parmelia incurva (Pers.) Fr. | PAIN14 |
| Arctoparmelia incurva | Xanthoparmelia incurva (Pers.) Hale | XAIN3 |
| arctoparmelia lichen | Arctoparmelia centrifuga (L.) Hale | ARCE60 |
| arctoparmelia lichen | Arctoparmelia Hale | ARCTO8 |
| arctoparmelia lichen | Arctoparmelia incurva (Pers.) Hale | ARIN60 |
| arctoparmelia lichen | Arctoparmelia separata (Th. Fr.) Hale | ARSE60 |
| arctoparmelia lichen | Arctoparmelia subcentrifuga (Oksner) Hale | ARSU12 |
| Arctoparmelia separata | Parmelia birulae Elenkin var. grumosa Llano | PABIG |
| Arctoparmelia separata | Parmelia separata Th. Fr. | PASE14 |
| Arctoparmelia separata | Xanthoparmelia separata (Th. Fr.) Hale | XASE |
| Arctoparmelia subcentrifuga | Parmelia subcentrifuga Oksner | PASU15 |
| Arctoparmelia subcentrifuga | Xanthoparmelia subcentrifuga (Oksner) Hale | XASU6 |
| arid xanthoparmelia lichen | Xanthoparmelia arida Egan & Derstine | XAAR2 |
| Arizona beard lichen | Usnea arizonica Mot. | USAR |
| Arnold's parmotrema lichen | Parmotrema arnoldii (Du Rietz) Hale | PAAR61 |
| Asahinea chrysantha | Cetraria chrysantha Tuck. | CECH5 |
| asahinea lichen | Asahinea Culb. & C. Culb. | ASAHI2 |
| Asahinea scholanderi | Cetraria scholanderi Llano | CESC6 |
| Bailey's beard lichen | Usnea baileyi (Stirton) Zahlbr. | USBA60 |
| Baltimore flavoparmelia lichen | Flavoparmelia baltimorensis (Gyelnik & Foriss) Hale | FLBA |
| beard lichen | Usnea aculeata Mot. | USAC |
| beard lichen | Usnea affinis Mot. | USAF |
| beard lichen | Usnea amabilis Mot. | USAM |
| beard lichen | Usnea angulata Ach. | USAN |
| beard lichen | Usnea australis Fr. | USAU |
| beard lichen | Usnea capillaris Mot. | USCA3 |
| beard lichen | Usnea catenulata Mot. | USCA4 |
| beard lichen | Usnea ceratina Ach. | USCE |
| beard lichen | Usnea ciliifera Mot. | USCI |
| beard lichen | Usnea cirrosa Mot. | USCI2 |
| beard lichen | Usnea cornuta Korber | USCO3 |
| beard lichen | Usnea Dill. ex Adans. | USNEA2 |
| beard lichen | Usnea dimorpha (Mull. Arg.) Mot. | USDI |
| beard lichen | Usnea diplotypus Vainio | USDI2 |
| beard lichen | Usnea duriuscula Mot. | USDU |
| beard lichen | Usnea endochrysea Stirton | USEN |
| beard lichen | Usnea erinacea Vainio | USER2 |
| beard lichen | Usnea fibrillosa Mot. | USFI60 |
| beard lichen | Usnea filipendula Stirton | USFI61 |
| beard lichen | Usnea fulvoreagens (Rasanen) Rasanen | USFU |
| beard lichen | Usnea furfurosula (Zahlbr.) Mot. | USFU2 |
| beard lichen | Usnea glabrata (Ach.) Vainio | USGL60 |
| beard lichen | Usnea glabrescens (Nyl. ex Vainio) Vainio | USGL61 |
| beard lichen | Usnea graciosa Mot. | USGR |
| beard lichen | Usnea hesperina Mot. | USHE |
| beard lichen | Usnea hirta (L.) F. H. Wigg. | USHI60 |
| beard lichen | Usnea leucosticta Vainio | USLE60 |
| beard lichen | Usnea longissima Ach. | USLO50 |
| beard lichen | Usnea longissima Ach. var. corticata R. Howe | USLOC |
| beard lichen | Usnea mirabilis Mot. | USMI2 |
| beard lichen | Usnea monstruosa Vainio | USMO60 |
| beard lichen | Usnea mutabilis Stirton | USMU |
| beard lichen | Usnea pachyclada Mot. | USPA |
| beard lichen | Usnea ramillosa Mot. | USRA |
| beard lichen | Usnea retifera Mot. | USRE |
| beard lichen | Usnea roseola Vainio | USRO |
| beard lichen | Usnea rubicunda Stirton | USRU |
| beard lichen | Usnea sacbiosa Mot. | USSA |
| beard lichen | Usnea scabrata Nyl. | USSC2 |
| beard lichen | Usnea sphacelata R. Br. | USSP |
| beard lichen | Usnea stuppea (Rasanen) Mot. | USST |
| beard lichen | Usnea subfloridana Stirton | USSU60 |
| beard lichen | Usnea subfusca Stirton | USSU3 |
| beard lichen | Usnea subhirta Mot. | USSU4 |
| beard lichen | Usnea subscabrosa Mot. | USSU5 |
| beard lichen | Usnea substerilis Mot. | USSU6 |
| beard lichen | Usnea sylvatica Mot. | USSY |
| beard lichen | Usnea trichodea Ach. | USTR |
| beard lichen | Usnea tristis Mot. | USTR2 |
| beard lichen | Usnea vainioi Mot. | USVA |
| beard lichen | Usnea xanthopoga Nyl. | USXA |
| Bering's dactylina lichen | Dactylina beringica C. D. Bird & J. W. Thomson | DABE60 |
| Bitter tube lichen | Hypogymnia bitteri (Lynge) Ahti | HYBI60 |
| blackcurly lichen | Pseudephebe Choisy | PSEUD33 |
| blackcurly lichen | Pseudephebe minuscula (Nyl. ex Arnold) Brodo & D. Hawksw. | PSMI60 |
| blackcurly lichen | Pseudephebe pubescens (L.) Choisy | PSPU60 |
| bran lichen | Parmeliopsis (Stizenb.) Nyl. | PARME7 |
| bran lichen | Parmeliopsis hyperopta (Ach.) Arnold | PAHY61 |
| bran lichen | Parmeliopsis subambigua Gyelnik | PASU8 |
| brittle lichen | Cornicularia (Schreber) Hoffm. | CORNI |
| brittle lichen | Cornicularia normoerica (Gunn.) Du Rietz | CONO2 |
| brodoa lichen | Brodoa Goward | BRODO2 |
| Brodoa oroarctica | Brodoa intestiniformis (Vill.) Goward | BRIN9 |
| Brodoa oroarctica | Hypogymnia encausta (Sm.) Walter Watson | HYEN3 |
| Brodoa oroarctica | Hypogymnia intestiniformis (Vill.) Rasanen | HYIN3 |
| Brodoa oroarctica | Hypogymnia oroarctica Krog | HYOR2 |
| Brodoa oroarctica | Parmelia intestiniformis (Vill.) Ach. | PAIN18 |
| Bryocaulon divergens | Alectoria divergens (Ach.) Nyl. | ALDI9 |
| Bryocaulon divergens | Coelocaulon divergens (Ach.) R. Howe | CODI14 |
| Bryocaulon divergens | Cornicularia divergens Ach. | CODI15 |
| bryocaulon lichen | Bryocaulon divergens (Ach.) Karnefelt | BRDI60 |
| bryocaulon lichen | Bryocaulon Karnefelt | BRYOC2 |
| bryocaulon lichen | Bryocaulon pseudosatoanum (Asah.) Karnefelt | BRPS3 |
| Bryocaulon pseudosatoanum | Cornicularia pseudosatoana Asah. | COPS |
| Bryoria bicolor | Alectoria bicolor (Ehrh.) Nyl. | ALBI6 |
| Bryoria capillaris | Alectoria capillaris (Ach.) Crombie | ALCA17 |
| Bryoria capillaris | Alectoria setacea (Ach.) Mot. | ALSE6 |
| Bryoria cervinula | Alectoria cervinula Mot. | ALCE3 |
| Bryoria chalybeiformis | Alectoria chalybeiformis (L.) Gray | ALCH4 |
| Bryoria fremontii | Alectoria corneliae Gyelnik | ALCO11 |
| Bryoria fremontii | Alectoria fremontii Tuck. | ALFR3 |
| Bryoria fremontii | Alectoria tenerrima Mot. | ALTE9 |
| Bryoria furcellata | Alectoria nidulifera Norrlin | ALNI3 |
| Bryoria furcellata | Cornicularia fibrillosa (Ach.) Halsey | COFI4 |
| Bryoria fuscescens | Alectoria fuscescens Gyelnik | ALFU |
| Bryoria fuscescens | Alectoria positiva (Gyelnik) Mot. | ALPO8 |
| Bryoria fuscescens | Bryopogon pacificus Gyelnik | BRPA12 |
| Bryoria glabra | Alectoria glabra Mot. | ALGL14 |
| Bryoria implexa | Alectoria implexa (Hoffm.) Nyl. | ALIM2 |
| Bryoria lanestris | Alectoria lanestris (Ach.) Gyelnik | ALLA11 |
| Bryoria lanestris | Bryopogon negativus Gyelnik | BRNE3 |
| Bryoria nadvornikiana | Alectoria altaica (Gyelnik) Rasanen | ALAL10 |
| Bryoria nadvornikiana | Alectoria nadvornikiana Gyelnik | ALNA2 |
| Bryoria nitidula | Alectoria irvingii Llano | ALIR |
| Bryoria nitidula | Alectoria lanea auct. | ALLA10 |
| Bryoria nitidula | Alectoria nitidula (Th. Fr.) Vainio | ALNI4 |
| Bryoria pseudofuscescens | Alectoria achariana Gyelnik | ALAC7 |
| Bryoria pseudofuscescens | Alectoria norstictica Mot. | ALNO2 |
| Bryoria pseudofuscescens | Alectoria pseudofuscescens Gyelnik | ALPS4 |
| Bryoria pseudofuscescens | Alectoria subtilis Mot. | ALSU6 |
| Bryoria simplicior | Alectoria nana Mot. | ALNA3 |
| Bryoria simplicior | Alectoria simplicior (Vainio) Lynge | ALSI6 |
| Bryoria subcana | Alectoria subcana (Nyl. ex Stizenb.) Gyelnik | ALSU3 |
| Bryoria tenuis | Alectoria tenuis E. Dahl | ALTE10 |
| Bryoria tortuosa | Alectoria tortuosa G. Merr. | ALTO3 |
| Bryoria tortuosa | Alectoria virens auct. | ALVI9 |
| Bryoria trichodes ssp. americana | Alectoria ambigua Mot. | ALAM9 |
| Bryoria trichodes ssp. americana | Alectoria americana Mot. | ALAM10 |
| Bryoria trichodes ssp. trichodes | Alectoria canadensis Mot. | ALCA16 |
| Bryoria trichodes ssp. trichodes | Alectoria delicata Mot. | ALDE5 |
| Bulbothrix confoederata | Parmelia confoederata Culb. | PACO38 |
| Bulbothrix coronata | Parmelia coronata Fee | PACO42 |
| Bulbothrix goebelii | Parmelia goebelii Zenker | PAGO2 |
| Bulbothrix goebelii | Parmelia njalensis C. W. Dodge | PANJ |
| Bulbothrix goebelii | Parmelia scortella Nyl. | PASC16 |
| Bulbothrix laevigatula | Parmelia laevigatula Nyl. | PALA33 |
| bulbothrix lichen | Bulbothrix Hale | BULBO3 |
| bulbothrix lichen | Bulbothrix isidiza (Nyl.) Hale | BUIS |
| bulbothrix lichen | Bulbothrix laevigatula (Nyl.) Hale | BULA7 |
| California beard lichen | Usnea californica Herre | USCA2 |
| California xanthoparmelia lichen | Xanthoparmelia californica Hale | XACA7 |
| Canoparmelia amazonica | Parmelia amazonica Nyl. | PAAM7 |
| Canoparmelia amazonica | Pseudoparmelia amazonica (Nyl.) Hale | PSAM3 |
| Canoparmelia caroliniana | Parmelia caroliniana Nyl. | PACA24 |
| Canoparmelia caroliniana | Pseudoparmelia caroliniana (Nyl.) Hale | PSCA8 |
| Canoparmelia crozalsiana | Parmelia crozalsiana de Lesd. ex Harm. | PACR13 |
| Canoparmelia crozalsiana | Pseudoparmelia crozalsiana (de Lesd.) Hale | PSCR3 |
| Canoparmelia cryptochlorophaea | Parmelia cryptochlorophaea Hale | PACR14 |
| Canoparmelia cryptochlorophaea | Pseudoparmelia cryptochlorophaea (Hale) Hale | PSCR4 |
| canoparmelia lichen | Canoparmelia crozalsiana (de Lesd. ex Harm.) Elix & Hale | CACR23 |
| canoparmelia lichen | Canoparmelia cryptochlorophaea (Hale) Elix & Hale | CACR24 |
| canoparmelia lichen | Canoparmelia Elix & Hale | CANOP2 |
| canoparmelia lichen | Canoparmelia martinicana (Nyl.) Elix & Hale | CAMA39 |
| canoparmelia lichen | Canoparmelia salacinifera (Hale) Elix & Hale | CASA25 |
| Canoparmelia martinicana | Parmelia martinicana Nyl. | PAMA26 |
| Canoparmelia martinicana | Pseudoparmelia martinicana (Nyl.) Hale | PSMA10 |
| Canoparmelia salacinifera | Parmelia salacinifera Hale | PASA5 |
| Canoparmelia salacinifera | Pseudoparmelia salacinifera (Hale) Hale | PSSA5 |
| Canoparmelia texana | Parmelia texana Tuck. | PATE18 |
| Canoparmelia texana | Pseudoparmelia texana (Tuck.) Hale | PSTE8 |
| Carlott's horsehair lichen | Bryoria carlottae Brodo & D. Hawksw. | BRCA15 |
| Carolina canoparmelia lichen | Canoparmelia caroliniana (Nyl.) Elix & Hale | CACA68 |
| Catawba everniastrum lichen | Everniastrum catawbiense (Degel.) Hale ex Sipamn | EVCA3 |
| cavern beard lichen | Usnea cavernosa Tuck. | USCA60 |
| Cetraria aculeata | Coelocaulon aculeatum (Schreber) Link | COAC60 |
| Cetraria aculeata | Cornicularia aculeata (Schreber) Ach. | COAC3 |
| Cetraria ericetorum ssp. ericetorum | Cetraria crispa (Ach.) Nyl. | CECR4 |
| cetraria lichen | Cetraria Ach. | CETRA2 |
| cetraria lichen | Cetraria ericetorum Opiz | CEER6 |
| cetraria lichen | Cetraria ericetorum Opiz ssp. ericetorum | CEERE |
| cetraria lichen | Cetraria laevigata Rass. | CELA60 |
| cetraria lichen | Cetraria nigricans Nyl. | CENI60 |
| cetraria lichen | Cetraria odontella (Ach.) Ach. | CEOD60 |
| Cetraria muricata | Coelocaulon muricatum (Ach.) J. R. Laundon | COMU60 |
| Cetraria muricata | Cornicularia muricata (Ach.) Ach. | COMU6 |
| Cetraria odontella | Coelocaulon odontellum (Ach.) R. Howe | COOD3 |
| Cetraria odontella | Cornicularia odontella (Ach.) Westend. | COOD4 |
| Cetrariella delisei | Cetraria delisei (Bory ex Schaerer) Nyl. | CEDE60 |
| Cetrariella delisei | Cetraria hiascens (Fr.) Th. Fr. | CEHI2 |
| Cetrariella fastigiata | Cetraria fastigiata (Nyl.) Tuck. | CEFA60 |
| Cetrelia alaskana | Cetraria alaskana C. Culb. & Culb. | CEAL10 |
| Cetrelia cetrarioides | Parmelia cetrarioides (Delise ex Duby) Nyl. | PACE4 |
| Cetrelia chicitae | Cetraria chicitae Culb. | CECH3 |
| Cetrelia olivetorum | Parmelia olivaria (Ach.) Th. Fr. | PAOL5 |
| Cetrelia olivetorum | Parmelia olivetorum Nyl. | PAOL6 |
| Chicita's giant shield lichen | Cetrelia chicitae (Culb.) Culb. & C. Culb. | CECH2 |
| Chinese parmotrema lichen | Parmotrema chinense (Osbeck) Hale & Ahti | PACH11 |
| Chiricahua neofuscelia lichen | Neofuscelia chiricahuensis (R. Anderson & W. A. Weber) Essl. | NECH |
| cladonia light and dark lichen | Pseudevernia cladonia (Tuck.) Hale & Culb. | PSCL |
| Colorado xanthoparmelia lichen | Xanthoparmelia coloradoensis (Gyelnik) Hale | XACO5 |
| condensed beard lichen | Usnea condensata Mot. | USCO |
| Confederate bulbothrix lichen | Bulbothrix confoederata (Culb.) Hale | BUCO4 |
| confused beard lichen | Usnea confusa Asah. | USCO2 |
| crown bulbothrix lichen | Bulbothrix coronata (Fee) Hale | BUCO5 |
| Cumberland xanthoparmelia lichen | Xanthoparmelia cumberlandia (Gyelnik) Hale | XACU2 |
| dactylina lichen | Dactylina madreporiformis (Ach.) Tuck. | DAMA60 |
| dactylina lichen | Dactylina Nyl. | DACTY4 |
| dactylina lichen | Dactylina ramulosa (Hook.) Tuck. | DARA60 |
| Dactylina madreporiformis | Dufourea madreporiformis (Ach.) Ach. | DUMA2 |
| Darrow's flavopunctelia lichen | Flavopunctelia darrowi (J. W. Thomson) Hale | FLDA |
| deformed beard lichen | Usnea deformis Mot. | USDE |
| disjuct melanelia lichen | Melanelia disjuncta (Erichsen) Essl. | MEDI60 |
| Dominican parmotrema lichen | Parmotrema dominicanum (Vainio) Hale | PADO4 |
| duplicate tube lichen | Hypogymnia duplicata (Ach.) Rass. | HYDU60 |
| elegant melanelia lichen | Melanelia elegantula (Zahlbr.) Essl. | MEEL5 |
| Esslingeriana idahoensis | Cetraria idahoensis Essl. | CEID |
| esslingeriana lichen | Esslingeriana Hale & M. J. Lai | ESSLI |
| Evans's beard lichen | Usnea evansii Mot. | USEV |
| Evernia mesomorpha | Evernia thamnodes (Flotow) Arnold | EVTH |
| Everniastrum catawbiense | Cetrariastum catawbiense (Degel.) Culb. & C. Culb. | CECA17 |
| Everniastrum catawbiense | Everniastrum sorocheilum (Vainio) Hale ex Sipman | EVSO |
| Everniastrum catawbiense | Parmelia catawbiensis (Degel.) Hale & M. Wirth | PACA25 |
| Everniastrum catawbiense | Parmelia sorocheila Vainio | PASO8 |
| everniastrum lichen | Everniastrum Hale ex Sipman | EVERN3 |
| exasperated melanelia lichen | Melanelia exasperata (De Not.) Essl. | MEEX2 |
| Fendler's tuckermannopsis lichen | Tuckermannopsis fendleri (Nyl.) Hale | TUFE |
| Fink's beard lichen | Usnea finkii Zahlbr. | USFI2 |
| Flavocetraria cucullata | Cetraria cucullata (Bellardi) Ach. | CECU60 |
| Flavocetraria nivalis | Cetraria nivalis (L.) Ach. | CENI62 |
| Flavoparmelia baltimorensis | Parmelia baltimorensis Gyelnik & Foriss | PABA11 |
| Flavoparmelia baltimorensis | Pseudoparmelia baltimorensis (Gyelnik & Foriss) Hale | PSBA5 |
| Flavoparmelia caperata | Parmelia caperata (L.) Ach. | PACA23 |
| Flavoparmelia caperata | Parmelia cylisphora (Ach.) Vainio | PACY5 |
| Flavoparmelia caperata | Parmelia flavicans (Tuck.) Tuck. | PAFL12 |
| Flavoparmelia caperata | Parmelia herreana Zahlbr. | PAHE9 |
| Flavoparmelia caperata | Parmelia negativa Gyelnik | PANE11 |
| Flavoparmelia caperata | Pseudoparmelia caperata (L.) Hale | PSCA7 |
| Flavoparmelia concreta | Parmelia concreta Stizenb. | PACO37 |
| flavoparmelia lichen | Flavoparmelia caperata (L.) Hale | FLCA2 |
| flavoparmelia lichen | Flavoparmelia concreta (Stizenb.) | FLCO |
| flavoparmelia lichen | Flavoparmelia Hale | FLAVO |
| flavoparmelia lichen | Flavoparmelia rutidota (Hook. f. & Taylor) Hale | FLRU |
| Flavoparmelia rutidota | Parmelia conspersa (Ehrh. ex Ach.) Ach. var. subconspersa (Nyl.) Gyelnik | PACOS2 |
| Flavoparmelia rutidota | Parmelia rutidota Hook. f. & Taylor | PARU8 |
| Flavoparmelia rutidota | Pseudoparmelia rutidota (Hook. f. & Taylor) Hale | PSRU5 |
| Flavoparmelia rutidota | Xanthoparmelia subconspersa (Nyl.) Hale | XASU7 |
| Flavopunctelia darrowi | Parmelia darrowi J. W. Thomson | PADA2 |
| Flavopunctelia darrowi | Punctelia darrowi (J. W. Thomson) Krog | PUDA |
| Flavopunctelia flaventior | Parmelia andreana Mull. Arg. | PAAN12 |
| Flavopunctelia flaventior | Parmelia flaventior Stirton | PAFL11 |
| Flavopunctelia flaventior | Parmelia kernstockii (Lynge) Zahlbr. | PAKE3 |
| Flavopunctelia flaventior | Punctelia flaventior (Stirton) Krog | PUFL |
| flavopunctelia lichen | Flavopunctelia (Krog) Hale | FLAVO2 |
| flavopunctelia lichen | Flavopunctelia flaventior (Stirton) Hale | FLFL2 |
| flavopunctelia lichen | Flavopunctelia praesignis (Nyl.) Hale | FLPR3 |
| flavopunctelia lichen | Flavopunctelia soredica (Nyl.) Hale | FLSO2 |
| Flavopunctelia praesignis | Parmelia caperata (L.) Ach. var. incorrupta (J. Moore) E. C. Berry | PACAI |
| Flavopunctelia praesignis | Parmelia incorrupta J. Moore | PAIN13 |
| Flavopunctelia praesignis | Parmelia praesignis Nyl. | PAPR16 |
| Flavopunctelia praesignis | Punctelia praesignis (Nyl.) Krog | PUPR |
| Flavopunctelia soredica | Parmelia manshurica Asah. | PAMA24 |
| Flavopunctelia soredica | Parmelia soredica Nyl. | PASO6 |
| Flavopunctelia soredica | Parmelia ulophyllodes (Vainio) Savicz | PAUL3 |
| Flavopunctelia soredica | Punctelia soredica (Nyl.) Krog | PUSO |
| Florida beard lichen | Usnea florida (L.) F. H. Wigg. | USFL |
| fragile beard lichen | Usnea fragilescens Hav. ex Lynge | USFR |
| Fremont's horsehair lichen | Bryoria fremontii (Tuck.) Brodo & D. Hawksw. | BRFR60 |
| Frey's beard lichen | Usnea freyi Mot. | USFR2 |
| giant shield lichen | Cetrelia cetrarioides (Duby) Culb. & C. Culb. | CECE4 |
| giant shield lichen | Cetrelia Culb. & C. Culb. | CETRE |
| giant shield lichen | Cetrelia monachorum (Zahlbr.) Culb. & C. Culb. | CEMO4 |
| giant shield lichen | Cetrelia olivetorum (Nyl.) Culb. & C. Culb. | CEOL2 |
| Goebel's bulbothrix lichen | Bulbothrix goebelii (Zenker) Hale | BUGO |
| golden asahinea lichen | Asahinea chrysantha (Tuck.) Culb. & C. Culb. | ASCH60 |
| greenleaf tuckermannopsis lichen | Tuckermannopsis chlorophylla (Willd.) Hale | TUCH60 |
| Hale's melanelia lichen | Melanelia halei (Ahti) Essl. | MEHA8 |
| Herre's ragged lichen | Platismatia herrei (Imshaug) Culb. & C. Culb. | PLHE60 |
| honeycombed lichen | Menegazzia A. Massal. | MENEG |
| honeycombed lichen | Menegazzia terebrata (Hoffm.) A. Massal. | METE7 |
| horsehair lichen | Bryoria Brodo & D. Hawksw. | BRYOR2 |
| horsehair lichen | Bryoria capillaris (Ach.) Brodo & D. Hawksw. | BRCA14 |
| horsehair lichen | Bryoria cervinula Mot. ex Brodo & D. Hawksw. | BRCE |
| horsehair lichen | Bryoria chalybeiformis (L.) Brodo & D. Hawksw. | BRCH60 |
| horsehair lichen | Bryoria friabilis Brodo & D. Hawksw. | BRFR6 |
| horsehair lichen | Bryoria furcellata (Fr.) Brodo & D. Hawksw. | BRFU3 |
| horsehair lichen | Bryoria fuscescens (Gyelnik) Brodo & D. Hawksw. | BRFU60 |
| horsehair lichen | Bryoria implexa (Hoffm.) Brodo & D. Hawksw. | BRIM |
| horsehair lichen | Bryoria lanestris (Ach.) Brodo & D. Hawksw. | BRLA60 |
| horsehair lichen | Bryoria nitidula (Th. Fr.) Brodo & D. Hawksw. | BRNI60 |
| horsehair lichen | Bryoria pseudocapillaris Brodo & D. Hawksw. | BRPS4 |
| horsehair lichen | Bryoria pseudofuscescens (Gyelnik) Brodo & D. Hawksw. | BRPS60 |
| horsehair lichen | Bryoria salazinica Brodo & D. Hawksw. | BRSA2 |
| horsehair lichen | Bryoria simplicior (Vainio) Brodo & D. Hawksw. | BRSI60 |
| horsehair lichen | Bryoria spiralifera Brodo & D. Hawksw. | BRSP5 |
| horsehair lichen | Bryoria subcana (Nyl. ex Stizenb.) Brodo & D. Hawksw. | BRSU6 |
| horsehair lichen | Bryoria tenuis (E. Dahl) Brodo & D. Hawksw. | BRTE60 |
| horsehair lichen | Bryoria trichodes (Michaux) Brodo & D. Hawksw. | BRTR10 |
| horsehair lichen | Bryoria trichodes (Michaux) Brodo & D. Hawksw. ssp. trichodes | BRTRT |
| Huachuca xanthoparmelia lichen | Xanthoparmelia huachucensis (T. Nash) Egan | XAHU |
| Hulten's pitted lichen | Cavernularia hultenii Degel. | CAHU60 |
| Hypogymnia austerodes | Parmelia austerodes Nyl. | PAAU10 |
| Hypogymnia bitteri | Parmelia bitteri Lynge | PABI9 |
| Hypogymnia duplicata | Hypogymnia elongata (Hillm.) Rass. | HYEL6 |
| Hypogymnia farinacea | Hypogymnia bitteriana (Zahlbr.) Rasanen | HYBI6 |
| Hypogymnia oceanica | Hypogymnia pseudophysodes (Asah.) Rass. | HYPS60 |
| Hypogymnia physodes | Parmelia duplicata Sm. ex Ach. var. douglasicola Gyelnik | PADUD |
| Hypogymnia physodes | Parmelia oregana Gyelnik | PAOR9 |
| Hypogymnia physodes | Parmelia physodes (L.) Ach. | PAPH3 |
| Hypogymnia subobscura | Parmelia subobscura Vainio | PASU23 |
| Hypogymnia tubulosa | Parmelia tubulosa (Schaerer) Bitter | PATU5 |
| Hypogymnia vittata | Parmelia vittata (Ach.) Nyl. | PAVI14 |
| Hypotrachyna croceopustulata | Parmelia croceopustulata Kurok. | PACR12 |
| Hypotrachyna densirhizinata | Parmelia densirhizinata Kurok. | PADE15 |
| Hypotrachyna dentella | Parmelia dentella Hale & Kurok. | PADE16 |
| Hypotrachyna ensifolia | Parmelia ensifolia Kurok. | PAEN7 |
| Hypotrachyna ensifolia | Parmelia lobulifera Degel. var. insensitiva Degel. | PALOI |
| Hypotrachyna gondylophora | Parmelia gondylophora Hale | PAGO3 |
| Hypotrachyna imbricatula | Parmelia imbricatula Zahlbr. | PAIM5 |
| Hypotrachyna imbricatula | Parmelia lobulifera Degel. | PALO12 |
| Hypotrachyna imbricatula | Parmelia lobulifera Degel. var. luteoreagens Degel. | PALOL |
| Hypotrachyna laevigata | Parmelia laevigata (Sm.) Ach. | PALA32 |
| hypotrachyna lichen | Hypotrachyna (Vainio) Hale | HYPOT2 |
| hypotrachyna lichen | Hypotrachyna croceopustulata (Kurok.) Hale | HYCR5 |
| hypotrachyna lichen | Hypotrachyna densirhizinata (Kurok.) Hale | HYDE8 |
| hypotrachyna lichen | Hypotrachyna dentella (Hale & Kurok.) Hale | HYDE60 |
| hypotrachyna lichen | Hypotrachyna ensifolia (Kurok.) Hale | HYEN2 |
| hypotrachyna lichen | Hypotrachyna gondylophora (Hale) Hale | HYGO |
| hypotrachyna lichen | Hypotrachyna imbricatula (Zahlbr.) Hale | HYIM2 |
| hypotrachyna lichen | Hypotrachyna laevigata (Sm.) Hale | HYLA13 |
| hypotrachyna lichen | Hypotrachyna livida (Taylor) Hale | HYLI5 |
| hypotrachyna lichen | Hypotrachyna osseoalba (Vainio) Park & Hale | HYOS |
| hypotrachyna lichen | Hypotrachyna polydactyla (Krog & Swinscow) T. Nash | HYPO6 |
| hypotrachyna lichen | Hypotrachyna producta Hale | HYPR5 |
| hypotrachyna lichen | Hypotrachyna prolongata (Kurok.) Hale | HYPR6 |
| hypotrachyna lichen | Hypotrachyna pseudosinuosa (Asah.) Hale | HYPS2 |
| hypotrachyna lichen | Hypotrachyna pulvinata (Fee) Hale | HYPU7 |
| hypotrachyna lichen | Hypotrachyna pustulifera (Hale) Skorepa | HYPU8 |
| hypotrachyna lichen | Hypotrachyna revoluta (Florke) Hale | HYRE4 |
| hypotrachyna lichen | Hypotrachyna subsaxatilis (de Lesd.) Hale | HYSU6 |
| hypotrachyna lichen | Hypotrachyna thysanota (Kurok.) Hale | HYTH |
| Hypotrachyna livida | Parmelia livida Taylor | PALI13 |
| Hypotrachyna oostingii | Parmelia oostingii J. P. Dey | PAOO2 |
| Hypotrachyna osseoalba | Hypotrachyna formosana (Zahlbr.) Hale | HYFO3 |
| Hypotrachyna osseoalba | Parmelia formosana Zahlbr. | PAFO5 |
| Hypotrachyna producta | Parmelia producta (Hale) J. P. Dey | PAPR19 |
| Hypotrachyna prolongata | Hypotrachyna rachista (Hale) Hale | HYRA7 |
| Hypotrachyna prolongata | Parmelia lobulifera Degel. var. sanguineoreagens Degel. | PALOS |
| Hypotrachyna prolongata | Parmelia prolongata Kurok. | PAPR20 |
| Hypotrachyna prolongata | Parmelia rachista Hale | PARA15 |
| Hypotrachyna pulvinata | Parmelia pulvinata Fee | PAPU15 |
| Hypotrachyna pustulifera | Parmelia pustulifera Hale | PAPU16 |
| Hypotrachyna revoluta | Parmelia revoluta Florke | PARE15 |
| Hypotrachyna rockii | Parmelia rockii Zahlbr. | PARO9 |
| Hypotrachyna sinuosa | Parmelia sinuosa (Sm.) Ach. | PASI4 |
| Hypotrachyna thysanota | Parmelia thysanota Kurok. | PATH5 |
| Hypotrachyna virginica | Parmelia virginica Hale | PAVI13 |
| Idaho esslingeriana lichen | Esslingeriana idahoensis (Essl.) Hale & M. J. Lai | ESID |
| Idaho xanthoparmelia lichen | Xanthoparmelia idahoensis Hale | XAID |
| Imshaug's tube lichen | Hypogymnia imshaugii Krog | HYIM60 |
| Imshaugia aleurites | Parmeliopsis aleurites (Ach.) Nyl. | PAAL26 |
| imshaugia lichen | Imshaugia aleurites (Ach.) S. F. Meyer | IMAL60 |
| imshaugia lichen | Imshaugia placorodia (Ach.) S. F. Meyer | IMPL |
| imshaugia lichen | Imshaugia S. F. Meyer | IMSHA2 |
| Imshaugia placorodia | Parmeliopsis placorodia (Ach.) Nyl. | PAPL11 |
| inactive tube lichen | Hypogymnia inactiva (Krog) Ohlsson | HYIN2 |
| intense light and dark lichen | Pseudevernia intensa (Nyl.) Hale & Culb. | PSIN5 |
| island cetraria lichen | Cetraria islandica (L.) Ach. | CEIS60 |
| island cetraria lichen | Cetraria islandica (L.) Ach. ssp. crispiformis (Rasanen) Karnefelt | CEISC |
| Kaernefeltia californica | Alectoria californica (Tuck.) G. Merr. | ALCA15 |
| Kaernefeltia californica | Alectoria cetrariza Nyl. | ALCE4 |
| Kaernefeltia californica | Cetraria californica Tuck. | CECA14 |
| Kaernefeltia californica | Cornicularia californica (Tuck.) Du Rietz | COCA37 |
| Kaernefeltia californica | Tuckermannopsis californica (Tuck.) | TUCA3 |
| Kaernefeltia merrillii | Cetraria merrillii Du Rietz | CEME4 |
| Kaernefeltia merrillii | Tuckermannopsis merrillii (Du Rietz) Hale | TUME |
| Kamchatka cetraria lichen | Cetraria kamczatica Savicz | CEKA60 |
| Kamchatka xanthoparmelia lichen | Xanthoparmelia camtschadalis (Ach.) Hale | XACA8 |
| Krog's tube lichen | Hypogymnia krogiae Ohlsson | HYKR |
| Lapland beard lichen | Usnea lapponica Vainio | USLA60 |
| Letharia columbiana | Letharia californica (Lev.) Hue | LECA53 |
| Letharia vulpina | Evernia vulpina (L.) Ach. | EVVU |
| light and dark lichen | Pseudevernia consocians (Vainio) Hale & Culb. | PSCO9 |
| light and dark lichen | Pseudevernia Zopf | PSEUD34 |
| Louisiana parmotrema lichen | Parmotrema louisianae (Hale) Hale | PALO11 |
| Madagascar parmotrema lichen | Parmotrema madagascariaceum (Hue) Hale | PAMA20 |
| manyspore melanelia lichen | Melanelia multispora (A. Schneider) Essl. | MEMU60 |
| Margarite parmotrema lichen | Parmotrema margaritatum (Hue) Hale | PAMA21 |
| Maricopa xanthoparmelia lichen | Xanthoparmelia maricopensis T. Nash & Elix | XAMA3 |
| masonhalea lichen | Masonhalea Karnefelt | MASON2 |
| Masonhalea richardsonii | Cetraria richardsonii Hook. | CERI3 |
| Melanelia agnata | Cetraria agnata (Nyl.) Kristinsson | CEAG2 |
| Melanelia albertana | Parmelia albertana Ahti | PAAL23 |
| Melanelia commixta | Cetraria commixta (Nyl.) Th. Fr. | CECO60 |
| Melanelia commixta | Cetraria fahunensis (L.) Schreber | CEFA4 |
| Melanelia culbersonii | Cetraria culbersonii Hale | CECU4 |
| Melanelia disjuncta | Melanelia granulosa (Lynge) Essl. | MEGR9 |
| Melanelia disjuncta | Parmelia denalii Krog | PADE14 |
| Melanelia disjuncta | Parmelia disjuncta Erichsen | PADI20 |
| Melanelia disjuncta | Parmelia granulosa Lynge | PAGR7 |
| Melanelia elegantula | Melanelia incolorata (Parr.) Essl. | MEIN13 |
| Melanelia elegantula | Parmelia elegantula (Zahlbr.) Szat. | PAEL5 |
| Melanelia exasperata | Parmelia aspera A. Massal. | PAAS4 |
| Melanelia exasperata | Parmelia aspidota (Ach.) Poetsch | PAAS5 |
| Melanelia exasperata | Parmelia exasperata De Not. | PAEX2 |
| Melanelia exasperatula | Parmelia exasperatula Nyl. | PAEX3 |
| Melanelia fuliginosa | Melanelia glabratula (Lamy) Essl. | MEGL7 |
| Melanelia fuliginosa | Parmelia glabratula (Lamy) Nyl. | PAGL12 |
| Melanelia glabra | Parmelia glabra (Schaerer) Nyl. | PAGL11 |
| Melanelia glabroides | Parmelia glabroides Essl. | PAGL13 |
| Melanelia halei | Parmelia halei Ahti | PAHA11 |
| Melanelia hepatizon | Cetraria hepatizon (Ach.) Vainio | CEHE60 |
| Melanelia hepatizon | Cetraria polyschiza (Nyl.) Jatta | CEPO5 |
| Melanelia infumata | Parmelia infumata Nyl. | PAIN16 |
| melanelia lichen | Melanelia Essl. | MELAN5 |
| melanelia lichen | Melanelia exasperatula (Nyl.) Essl. | MEEX60 |
| melanelia lichen | Melanelia fuliginosa (Fr. ex Duby) Essl. | MEFU60 |
| melanelia lichen | Melanelia glabroides (Essl.) Essl. | MEGL6 |
| melanelia lichen | Melanelia infumata (Nyl.) Essl. | MEIN60 |
| melanelia lichen | Melanelia olivacea (L.) Eassl. | MEOL60 |
| melanelia lichen | Melanelia olivaceoides (Krog) Essl. | MEOL61 |
| melanelia lichen | Melanelia panniformis (Nyl.) Essl. | MEPA60 |
| melanelia lichen | Melanelia septentrionalis (Lynge) Essl. | MESE60 |
| melanelia lichen | Melanelia sorediata (Ach.) Goward & Ahti | MESO60 |
| melanelia lichen | Melanelia stygia (L.) Essl. | MEST60 |
| melanelia lichen | Melanelia subargentifera (Nyl.) Essl. | MESU4 |
| melanelia lichen | Melanelia subaurifera (Nyl.) Essl. | MESU60 |
| melanelia lichen | Melanelia subelegantula (Essl.) Essl. | MESU10 |
| melanelia lichen | Melanelia subolivacea (Nyl.) Essl. | MESU61 |
| melanelia lichen | Melanelia trabeculata (Ahti) Essl. | METR61 |
| Melanelia multispora | Parmelia multispora A. Schneider | PAMU15 |
| Melanelia olivacea | Parmelia olivacea (L.) Ach. | PAOL3 |
| Melanelia olivaceoides | Parmelia olivaceoides Krog | PAOL4 |
| Melanelia panniformis | Parmelia panniformis (Nyl.) Vainio | PAPA34 |
| Melanelia septentrionalis | Parmelia septentrionalis (Lynge) Ahti | PASE15 |
| Melanelia sorediata | Melanelia sorediosa (Almb.) Essl. | MESO2 |
| Melanelia sorediata | Parmelia sorediata (Ach.) Th. Fr. | PASO5 |
| Melanelia sorediata | Parmelia sorediosa Almb. | PASO7 |
| Melanelia stygia | Parmelia stygia (L.) Ach. | PAST18 |
| Melanelia subargentifera | Parmelia conspurcata (Schaerer) Vainio | PACO41 |
| Melanelia subargentifera | Parmelia subargentifera Nyl. | PASU13 |
| Melanelia subaurifera | Parmelia subaurifera Nyl. | PASU14 |
| Melanelia subelegantula | Parmelia subelegantula Essl. | PASU19 |
| Melanelia subolivacea | Parmelia subolivacea Nyl. | PASU24 |
| Melanelia tominii | Melanelia substygia (Rasanen) Essl. | MESU62 |
| Melanelia tominii | Parmelia saximontana R. Anderson & W. A. Weber | PASA7 |
| Melanelia tominii | Parmelia substygia Rasanen | PASU29 |
| Melanelia trabeculata | Parmelia trabeculata Ahti | PATR11 |
| Melliss's parmotrema lichen | Parmotrema mellissii (C. W. Dodge) Hale | PAME9 |
| Menegazzia terebrata | Menegazzia pertusa (Schrank) Stein | MEPE10 |
| Menegazzia terebrata | Parmelia pertusa (Schrank) Schaerer | PAPE16 |
| Menegazzia terebrata | Parmelia sipeana Gyelnik | PASI5 |
| Merrill's beard lichen | Usnea merrillii Mot. | USME |
| Mexican xanthoparmelia lichen | Xanthoparmelia mexicana (Gyelnik) Hale | XAME |
| Michaux's beard lichen | Usnea michauxii I. Tav. | USMI |
| Michaux's parmotrema lichen | Parmotrema michauxianum (Zahlbr.) Hale | PAMI14 |
| Montezuma xanthoparmelia lichen | Xanthoparmelia moctezumensis T. Nash | XAMO |
| Morden's parmotrema lichen | Parmotrema mordenii (Hale) Hale | PAMO13 |
| Mougeot's xanthoparmelia lichen | Xanthoparmelia mougeotii (Schaerer) Hale | XAMO4 |
| mountain xanthoparmelia lichen | Xanthoparmelia montanensis Hale | XAMO2 |
| Myelochroa aurulenta | Parmelia aurulenta Tuck. | PAAU9 |
| Myelochroa aurulenta | Parmelia silvestris Degel. | PASI2 |
| Myelochroa aurulenta | Parmelina aurulenta (Tuck.) Hale | PAAU12 |
| Myelochroa galbina | Parmelia galbina Ach. | PAGA2 |
| Myelochroa galbina | Parmelia subquercifolia Hue | PASU26 |
| Myelochroa galbina | Parmelina galbina (Ach.) Hale | PAGA3 |
| myelochroa lichen | Myelochroa (Asah.) Elix & Hale | MYELO |
| myelochroa lichen | Myelochroa aurulenta (Tuck.) Elix & Hale | MYAU |
| myelochroa lichen | Myelochroa galbina (Ach.) Elix & Hale | MYGA2 |
| myelochroa lichen | Myelochroa metarevoluta (Asah.) Elix & Hale | MYME4 |
| myelochroa lichen | Myelochroa obsessa (Ach.) Elix & Hale | MYOB2 |
| Myelochroa metarevoluta | Parmelia metarevoluta Asah. | PAME12 |
| Myelochroa metarevoluta | Parmelina metarevoluta (Asah.) Hale | PAME14 |
| Myelochroa obsessa | Parmelia finkii Zahlbr. | PAFI11 |
| Myelochroa obsessa | Parmelia obsessa Ach. | PAOB4 |
| Myelochroa obsessa | Parmelina obsessa (Ach.) Hale | PAOB5 |
| Nadvornik's horsehair lichen | Bryoria nadvornikiana (Gyelnik) Brodo & D. Hawksw. | BRNA60 |
| Neofuscelia ahtii | Parmelia ahtii Essl. | PAAH3 |
| Neofuscelia atticoides | Parmelia atticoides Essl. | PAAT |
| Neofuscelia brunella | Parmelia brunella Essl. | PABR8 |
| Neofuscelia chiricahuensis | Parmelia chiricahuensis R. Anderson & W. A. Weber | PACH12 |
| Neofuscelia infrapallida | Parmelia infrapallida Essl. | PAIN15 |
| neofuscelia lichen | Neofuscelia atticoides (Essl.) Essl. | NEAT |
| neofuscelia lichen | Neofuscelia brunella (Essl.) Essl. | NEBR3 |
| neofuscelia lichen | Neofuscelia Essl. | NEOFU |
| neofuscelia lichen | Neofuscelia infrapallida (Essl.) Essl. | NEIN4 |
| neofuscelia lichen | Neofuscelia loxodes (Nyl.) Essl. | NELO4 |
| neofuscelia lichen | Neofuscelia pustulosa (Essl.) Essl. | NEPU6 |
| neofuscelia lichen | Neofuscelia subhosseana (Essl.) Essl. | NESU |
| neofuscelia lichen | Neofuscelia verruculifera (Nyl.) Essl. | NEVE3 |
| Neofuscelia loxodes | Parmelia isidiotyla Nyl. | PAIS5 |
| Neofuscelia loxodes | Parmelia loxodes Nyl. | PALO14 |
| Neofuscelia occidentalis | Parmelia occidentalis Essl. | PAOC3 |
| Neofuscelia subhosseana | Parmelia subhosseana Essl. | PASU20 |
| Neofuscelia verruculifera | Parmelia verruculifera Nyl. | PAVE8 |
| netted rimelia lichen | Rimelia reticulata (Taylor) Hale & Fletcher | RIRE3 |
| New Mexico xanthoparmelia lichen | Xanthoparmelia novomexicana (Gyelnik) Hale | XANO3 |
| new Wyoming xanthoparmelia lichen | Xanthoparmelia neowyomingica Hale | XANE4 |
| Nodobryoria abbreviata | Alectoria abbreviata (Mull. Arg.) R. Howe | ALAB |
| Nodobryoria abbreviata | Bryoria abbreviata (Mull. Arg.) Brodo & D. Hawksw. | BRAB |
| Nodobryoria oregana | Alectoria oregana Tuck. | ALOR2 |
| Nodobryoria oregana | Bryoria oregana (Tuck. ex Willey) Brodo & D. Hawksw. | BROR6 |
| Nodobryoria subdivergens | Alectoria subdivergens E. Dahl | ALSU4 |
| Nodobryoria subdivergens | Bryoria subdivergens (E. Dahl) Brodo & D. Hawksw. | BRSU7 |
| Norwegian ragged lichen | Platismatia norvegica (Lynge) Culb. & C. Culb. | PLNO60 |
| Oosting's hypotrachyna lichen | Hypotrachyna oostingii (J. P. Dey) Hale | HYOO |
| Oriental cetraria lichen | Cetraria islandica (L.) Ach. ssp. orientalis (Asah.) Karnefelt | CEISO |
| ornate anzia lichen | Anzia ornata (Zahlbr.) Asah. | ANOR3 |
| Pacific parmotrema lichen | Parmotrema austrosinense (Zahlbr.) Hale | PAAU8 |
| Paraparmelia alabamensis | Parmelia alabamensis Hale & McCull. | PAAL22 |
| Paraparmelia alabamensis | Pseudoparmelia alabamensis (Hale & McCull.) Hale | PSAL2 |
| paraparmelia lichen | Paraparmelia Elix & J. Johnston | PARAP4 |
| Parmelia pseudosulcata | Parmelia kerguelensis auct. | PAKE4 |
| Parmelia saxatilis | Parmelia kerguelensis A. Wilson | PAKE2 |
| Parmelia skultii | Parmelia omphalodes (L.) Ach. ssp. glacialis Skult | PAOMG |
| parmelina | Parmelina Hale | PARME4 |
| parmelina | Parmelina quercina (Willd.) Hale | PAQU4 |
| Parmelina quercina | Parmelia quercina (Willd.) Vainio | PAQU5 |
| parmelinopsis | Parmelinopsis Elix & Hale | PARME5 |
| parmelinopsis | Parmelinopsis horrescens (Taylor) Elix & Hale | PAHO3 |
| parmelinopsis | Parmelinopsis minarum (Vainio) Elix & Hale | PAMI13 |
| parmelinopsis | Parmelinopsis spumosa (Asah.) Elix & Hale | PASP10 |
| Parmelinopsis horrescens | Parmelia horrescens Taylor | PAHO4 |
| Parmelinopsis horrescens | Parmelina horrescens (Taylor) Hale | PAHO5 |
| Parmelinopsis minarum | Parmelia dissecta Nyl. | PADI21 |
| Parmelinopsis minarum | Parmelia hubrichtii E. C. Berry | PAHU6 |
| Parmelinopsis minarum | Parmelina dissecta (Nyl.) Hale | PADI23 |
| Parmelinopsis minarum | Parmelina minarum (Vainio) Skorepa | PAMI19 |
| Parmelinopsis spumosa | Parmelia spumosa Asah. | PASP13 |
| Parmelinopsis spumosa | Parmelina spumosa (Asah.) Hale | PASP14 |
| Parmelinopsis swinscowii | Parmelia swinscowii Hale | PASW2 |
| Parmelinopsis swinscowii | Parmelina swinscowii (Hale) Hale | PASW3 |
| Parmeliopsis ambigua | Foraminella ambigua (Wulfen) S. F. Meyer | FOAM |
| Parmeliopsis hyperopta | Foraminella hyperopta (Ach.) S. F. Meyer | FOHY |
| Parmeliopsis hyperopta | Parmeliopsis diffusa (Weber) Riddle | PADI24 |
| Parmeliopsis subambigua | Foraminella subambigua (Gyelnik) S. F. Meyer | FOSU2 |
| Parmeliopsis subambigua | Parmeliopsis halei (Tuck.) Hale | PAHA12 |
| Parmotrema arnoldii | Parmelia arnoldii Du Rietz | PAAR12 |
| Parmotrema austrosinense | Parmelia austrosinensis Zahlbr. | PAAU11 |
| Parmotrema chinense | Parmelia perlata (Hudson) Ach. | PAPE13 |
| Parmotrema chinense | Parmelia trichotera Hue | PATR12 |
| Parmotrema chinense | Parmotrema perlatum (Hudson) Choisy | PAPE17 |
| Parmotrema crinitum | Parmelia crinita Ach. | PACR10 |
| Parmotrema cristiferum | Parmelia cristifera Taylor | PACR11 |
| Parmotrema dilatatum | Parmelia dilatata Vainio | PADI19 |
| Parmotrema dominicanum | Parmelia dominicana Vainio | PADO5 |
| Parmotrema endosulphureum | Parmelia endosulphurea (Hillm.) Hale | PAEN5 |
| Parmotrema eurysacum | Parmelia eurysaca Hue | PAEU4 |
| Parmotrema eurysacum | Parmelia permaculata Hale | PAPE14 |
| Parmotrema gardneri | Parmelia robusta Degel. | PARO8 |
| Parmotrema gardneri | Parmotrema robustum (Degel.) Hale | PARO7 |
| Parmotrema hababianum | Parmelia hababiana Gyelnik | PAHA9 |
| Parmotrema hypoleucinum | Parmelia hypoleucina J. Steiner | PAHY9 |
| Parmotrema hypotropum | Parmelia cetrata Ach. var. hypotropoides Nyl. ex Willey | PACEH |
| Parmotrema hypotropum | Parmelia hypotropa Ny. | PAHY13 |
| Parmotrema internexum | Parmelia internexa Nyl. | PAIN17 |
| parmotrema lichen | Parmotrema A. Massal. | PARMO |
| parmotrema lichen | Parmotrema crinitum (Ach.) Choisy | PACR8 |
| parmotrema lichen | Parmotrema cristiferum (Taylor) Hale | PACR9 |
| parmotrema lichen | Parmotrema dilatatum (Vainio) Hale | PADI16 |
| parmotrema lichen | Parmotrema endosulphureum (Hillm.) Hale | PAEN4 |
| parmotrema lichen | Parmotrema eurysacum (Hue) Hale | PAEU3 |
| parmotrema lichen | Parmotrema hababianum (Gyelnik) Hale | PAHA6 |
| parmotrema lichen | Parmotrema hypoleucinum (Steiner) Hale | PAHY6 |
| parmotrema lichen | Parmotrema hypotropum (Nyl.) Hale | PAHY7 |
| parmotrema lichen | Parmotrema internexum (Nyl.) Hale | PAIN12 |
| parmotrema lichen | Parmotrema praesorediosum (Nyl.) Hale | PAPR14 |
| parmotrema lichen | Parmotrema preperforatum (Culb.) Hale | PAPR15 |
| parmotrema lichen | Parmotrema rampoddense (Nyl.) Hale | PARA14 |
| parmotrema lichen | Parmotrema stuppeum (Taylor) Hale | PAST14 |
| parmotrema lichen | Parmotrema tinctorum (Delise ex Nyl.) Hale | PATI3 |
| parmotrema lichen | Parmotrema ultralucens (Krog) Hale | PAUL |
| parmotrema lichen | Parmotrema xanthinum (Mull. Arg.) Hale | PAXA5 |
| Parmotrema louisianae | Parmelia louisianae Hale | PALO13 |
| Parmotrema madagascariaceum | Parmelia chrysantha Tuck. | PACH14 |
| Parmotrema madagascariaceum | Parmelia madagascariacea (Hue) Abbayes | PAMA23 |
| Parmotrema margaritatum | Parmelia margaritata Hue | PAMA25 |
| Parmotrema mellissii | Parmelia mellissii C. W. Dodge | PAME11 |
| Parmotrema michauxianum | Parmelia epiclada Hale | PAEP |
| Parmotrema michauxianum | Parmelia michauxiana Zahlbr. | PAMI17 |
| Parmotrema mordenii | Parmelia mordenii Hale | PAMO15 |
| Parmotrema perforatum | Parmelia erecta E. C. Berry | PAER6 |
| Parmotrema perforatum | Parmelia hypotropoides Nyl. ex Willey | PAHY14 |
| Parmotrema perforatum | Parmelia perforata (Jacq.) Ach. | PAPE12 |
| Parmotrema praesorediosum | Parmelia praesorediosa Nyl. | PAPR17 |
| Parmotrema praesorediosum | Parmelia santae-crucis Vainio | PASA6 |
| Parmotrema preperforatum | Parmelia preperforata Culb. | PAPR18 |
| Parmotrema rampoddense | Parmelia rampoddensis Nyl. | PARA16 |
| Parmotrema rampoddense | Parmelia subinvoluta Hale | PASU21 |
| Parmotrema rigidum | Parmelia rigida Lynge | PARI9 |
| Parmotrema stuppeum | Parmelia claudelii (Harm.) Vainio | PACL8 |
| Parmotrema stuppeum | Parmelia maxima Hue | PAMA27 |
| Parmotrema stuppeum | Parmelia stuppea Taylor | PAST17 |
| Parmotrema sulphuratum | Parmelia sulphurata Nees & Flotow | PASU32 |
| Parmotrema tinctorum | Parmelia tinctorum Delise ex Nyl. | PATI4 |
| Parmotrema ultralucens | Parmelia subcrinita auct. | PASU16 |
| Parmotrema ultralucens | Parmelia ultralucens Krog | PAUL4 |
| Parmotrema xanthinum | Parmelia xanthina (Mull. Arg.) Vainio | PAXA6 |
| Parmotrema zollingeri | Parmelia zollingeri Hepp | PAZO2 |
| parmotremopsis | Parmotremopsis Elix & Hale | PARMO2 |
| Parmotremopsis antillensis | Parmelia antillensis Nyl. | PAAN13 |
| Parmotremopsis antillensis | Parmelina antillensis (Nyl.) Hale | PAAN14 |
| Pennsylvania beard lichen | Usnea pensylvanica Mot. | USPE |
| perforated parmotrema lichen | Parmotrema perforatum (Jacq.) A. Massal. | PAPE11 |
| perplexed beard lichen | Usnea perplexans Striton | USPE2 |
| piedmont xanthoparmelia lichen | Xanthoparmelia piedmontensis (Hale) Hale | XAPI2 |
| Pike's horsehair lichen | Bryoria pikei Brodo & D. Hawksw. | BRPI8 |
| pinnatifid shield lichen | Parmelia omphalodes (L.) Ach. ssp. pinnatifida (Kurok.) Skult | PAOMP |
| pitted lichen | Cavernularia Degel. | CAVER2 |
| pitted lichen | Cavernularia lophyrea (Ach.) Degel. | CALO60 |
| Platismatia glauca | Cetraria glauca (L.) Ach. | CEGL4 |
| Platismatia herrei | Cetraria herrei Imshaug | CEHE4 |
| Platismatia herrei | Cetraria tuckermanii Herre | CETU3 |
| Platismatia lacunosa | Cetraria lacunosa Ach. | CELA7 |
| Platismatia norvegica | Cetraria norvegica (Lynge) Du Rietz | CENO3 |
| Platismatia stenophylla | Cetraria stenophylla (Tuck.) G. K Merr. | CEST4 |
| Platismatia tuckermanii | Cetraria atlantica (Tuck.) Du Rietz | CEAT |
| Platismatia tuckermanii | Cetraria lacunosa Ach. var. atlantica Tuck. | CELAA2 |
| Platismatia tuckermanii | Cetraria tuckermanii Oakes | CETU2 |
| Plitt's xanthoparmelia lichen | Xanthoparmelia plittii (Gyelnik) Hale | XAPL2 |
| Pseudephebe minuscula | Alectoria minuscula (Nyl. ex Arnold) Degel. | ALMI9 |
| Pseudephebe pubescens | Alectoria pubescens (L.) R. Howe | ALPU9 |
| Pseudephebe pubescens | Parmelia lanata (L.) Wallr. | PALA34 |
| Pseudevernia cladonia | Parmelia cladonia (Tuck.) Du Rietz | PACL7 |
| Pseudevernia intensa | Evernia furfuracea (L.) W. Mann | EVFU |
| Pseudevernia intensa | Parmelia furfuracea (L.) Ach. | PAFU5 |
| Pseudevernia intensa | Pseudevernia furfuracea (L.) Zopf | PSFU |
| pseudoparmelia | Pseudoparmelia Lynge | PSEUD36 |
| pseudoparmelia | Pseudoparmelia sphaerospora (Nyl.) Hale | PSSP5 |
| Pseudoparmelia sphaerospora | Parmelia congruens Ach. | PACO39 |
| Pseudoparmelia sphaerospora | Parmelia cubensis Nyl. | PACU5 |
| Pseudoparmelia sphaerospora | Parmelia endoxanthoa G. Merr. | PAEN6 |
| Pseudoparmelia sphaerospora | Parmelia leucochlora Tuck. | PALE17 |
| Pseudoparmelia sphaerospora | Parmelia sphaerospora Nyl. | PASP11 |
| punctelia | Punctelia bolliana (Mull. Arg.) Krog | PUBO3 |
| punctelia | Punctelia borreri (Sm.) Krog | PUBO4 |
| punctelia | Punctelia hypoleucites (Nyl.) Krog | PUHY |
| punctelia | Punctelia perreticulata (Rasanen) G. Wilh. & Ladd | PUPE |
| punctelia | Punctelia reddenda (Stirton) Krog | PURE2 |
| punctelia | Punctelia rudecta (Ach.) Krog | PURU2 |
| punctelia | Punctelia semansiana (Culb. & C. Culb.) Krog | PUSE |
| punctelia | Punctelia stictica (Duby) Krog | PUST2 |
| punctelia | Punctelia subpraesignis (Nyl.) Krog | PUSU4 |
| punctelia | Punctelia subrudecta (Nyl.) Krog | PUSU5 |
| Punctelia appalachensis | Parmelia appalachensis Culb. | PAAP3 |
| Punctelia bolliana | Parmelia bolliana Mull. Arg. | PABO9 |
| Punctelia bolliana | Parmelia frondifera G. Merr. | PAFR5 |
| Punctelia borreri | Parmelia borreri (Sm.) Turner | PABO10 |
| Punctelia borreri | Parmelia pseudoborreri Asah. | PAPS7 |
| Punctelia hypoleucites | Parmelia hypoleucites Nyl. | PAHY10 |
| Punctelia perreticulata | Parmelia perreticulata (Rasanen) Hale | PAPE15 |
| Punctelia punctilla | Punctelia missouriensis G. Wilh. & Ladd | PUMI |
| Punctelia reddenda | Parmelia reddenda Stirton | PARE12 |
| Punctelia rudecta | Parmelia rudecta Ach. | PARU7 |
| Punctelia semansiana | Parmelia semansiana Culb. & C. Culb. | PASE8 |
| Punctelia stictica | Parmelia stictica (Duby) Nyl. | PAST16 |
| Punctelia subpraesignis | Parmelia subpraesignis Nyl. | PASU25 |
| Punctelia subrudecta | Parmelia dubia (Wulfen) Schaerer | PADU2 |
| Punctelia subrudecta | Parmelia graminicola de Lesd. | PAGR6 |
| Punctelia subrudecta | Parmelia subrudecta Nyl. | PASU28 |
| Punctelia subrudecta | Parmelia ulophylla (Ach.) G. Merr. | PAUL2 |
| ragged lichen | Platismatia Culb. & C. Culb. | PLATI2 |
| ragged lichen | Platismatia glauca (L.) Culb. & C. Culb. | PLGL60 |
| ragged lichen | Platismatia lacunosa (Ach.) Culb. & C. Culb. | PLLA6 |
| ragged lichen | Platismatia stenophylla (Tuck.) Culb. & C. Culb. | PLST6 |
| Relicina abstrusa | Parmelia abstrusa Vainio | PAAB2 |
| Relicina eximbricata | Parmelia eximbricata (Gyelnik) Hale & Kurok. | PAEX4 |
| relicina lichen | Relicina (Hale & Kurok.) Hale | RELIC |
| relicina lichen | Relicina abstrusa (Vainio) Hale | REAB |
| relicina lichen | Relicina eximbricata (Gyelnik) Hale | REEX2 |
| reticulate cetraria lichen | Cetraria ericetorum Opiz ssp. reticulata (Rasanen) Karnefelt | CEERR |
| Richardson's masonhalea lichen | Masonhalea richardsonii (Hook.) Karnefelt | MARI60 |
| Rimelia cetrata | Parmelia acanthifolia Pers. | PAAC12 |
| Rimelia cetrata | Parmelia cetrata Ach. | PACE6 |
| Rimelia cetrata | Parmelia herrei Zahlbr. | PAHE10 |
| Rimelia cetrata | Parmelia reparata Stirton | PARE13 |
| Rimelia cetrata | Parmotrema cetratum (Ach.) Hale | PACE7 |
| Rimelia commensurata | Parmelia commensurata Hale | PACO36 |
| Rimelia commensurata | Parmotrema commensuratum (Hale) Hale | PACO43 |
| Rimelia diffractaica | Parmelia diffractaica Essl. | PADI18 |
| Rimelia diffractaica | Parmotrema diffractaicum (Essl.) Hale | PADI25 |
| rimelia lichen | Rimelia cetrata (Ach.) Hale & Fletcher | RICE2 |
| rimelia lichen | Rimelia commensurata (Hale) Hale & Fletcher | RICO6 |
| rimelia lichen | Rimelia diffractaica (Essl.) Hale & Fletcher | RIDI2 |
| rimelia lichen | Rimelia Hale & Fletcher | RIMEL2 |
| rimelia lichen | Rimelia simulans (Hale) Hale & Fletcher | RISI |
| rimelia lichen | Rimelia subisidiosa (Mull. Arg.) Hale & Fletcher | RISU3 |
| Rimelia reticulata | Parmelia reticulata Taylor in Mack. | PARE14 |
| Rimelia reticulata | Parmotrema reticulatum (Taylor) Choisy | PARE16 |
| Rimelia simulans | Parmelia simulans Hale | PASI3 |
| Rimelia simulans | Parmotrema simulans (Hale) Hale | PASI6 |
| Rimelia subisidiosa | Parmelia subisidiosa (Mull. Arg.) C. W. Dodge | PASU22 |
| Rimelia subisidiosa | Parmotrema subisidiosum (Mull. Arg.) Hale | PASU33 |
| Rimeliella conferenda | Parmotrema conferendum Hale | PACO35 |
| Rimeliella subsumpta | Parmelia subsumpta Nyl. | PASU30 |
| Rimeliella subsumpta | Parmotrema neotropicum Kurok. ex Hale | PANE10 |
| Rimeliella subsumpta | Parmotrema subsumptum (Nyl.) Hale | PASU9 |
| Rimeliella subtinctoria | Parmelia haitiensis Hale | PAHA10 |
| Rimeliella subtinctoria | Parmelia subcrinita Nyl. | PASU17 |
| Rimeliella subtinctoria | Parmelia subtinctoria Zahlbr. | PASU31 |
| Rimeliella subtinctoria | Parmotrema haitiense (Hale) Hale | PAHA7 |
| Rimeliella subtinctoria | Parmotrema subtinctorium (Zahlbr.) Hale | PASU10 |
| ring lichen | Evernia Ach. | EVERN2 |
| ring lichen | Evernia divaricata (L.) Ach. | EVDI |
| ring lichen | Evernia esorediosa (Mull. Arg.) Du Rietz | EVES |
| ring lichen | Evernia mesomorpha Nyl. | EVME60 |
| ring lichen | Evernia perfragilis Llano | EVPE60 |
| ring lichen | Evernia prunastri (L.) Ach. | EVPR2 |
| Rock's hypotrachyna lichen | Hypotrachyna rockii (Zahlbr.) Hale | HYRO6 |
| sandwort cetraria lichen | Cetraria arenaria Karnefelt | CEAR7 |
| Schmidt's xanthoparmelia lichen | Xanthoparmelia schmidtii Hale | XASC |
| Scholander's asahinea lichen | Asahinea scholanderi (Llano) Culb. & C. Culb. | ASSC60 |
| Scholander's beard lichen | Usnea scholanderi Llano | USSC61 |
| seaside tube lichen | Hypogymnia oceanica Goward | HYOC4 |
| shield lichen | Parmelia Ach. | PARME2 |
| shield lichen | Parmelia fertilis Mull. Arg. | PAFE5 |
| shield lichen | Parmelia fraudans (Nyl.) Nyl. | PAFR60 |
| shield lichen | Parmelia hygrophila Goward & Ahti | PAHY4 |
| shield lichen | Parmelia neodiscordans Hale | PANE9 |
| shield lichen | Parmelia omphalodes (L.) Ach. | PAOM2 |
| shield lichen | Parmelia omphalodes (L.) Ach. ssp. omphalodes | PAOMO |
| shield lichen | Parmelia saxatilis (L.) Ach. | PASA60 |
| shield lichen | Parmelia squarrosa Hale | PASQ2 |
| shield lichen | Parmelia sulcata Taylor | PASU63 |
| Showman's hypotrachyna lichen | Hypotrachyna showmanii Hale | HYSH |
| sinuous hypotrachyna lichen | Hypotrachyna sinuosa (Sm.) Hale | HYSI60 |
| Skult's shield lichen | Parmelia skultii Hale | PASK |
| smooth melanelia lichen | Melanelia glabra (Schaerer) Essl. | MEGL5 |
| soft beard lichen | Usnea fragilescens Hav. ex Lynge var. mollis (Vainio) Clerc | USFRM |
| stiff parmotrema lichen | Parmotrema rigidum (Lynge) Hale | PARI8 |
| strigose beard lichen | Usnea strigosa (Ach.) Eaton | USST2 |
| strigose beard lichen | Usnea strigosa (Ach.) Eaton ssp. major (Michaux) I. Tav. | USSTM |
| strigose beard lichen | Usnea strigosa (Ach.) Eaton ssp. rubiginea (Michaux) I. Tav. | USSTR |
| strigose beard lichen | Usnea strigosa (Ach.) Eaton ssp. strigosa | USSTS |
| sulphur parmotrema lichen | Parmotrema sulphuratum (Nees & Flotow) Hale | PASU11 |
| Swinscow's parmelinopsis | Parmelinopsis swinscowii (Hale) Elix & Hale | PASW |
| Tasmanian xanthoparmelia lichen | Xanthoparmelia tasmanica (Hook. f. & Taylor) Hale | XATA2 |
| Texan canoparmelia lichen | Canoparmelia texana (Tuck.) Elix & Hale | CATE22 |
| tortured horsehair lichen | Bryoria tortuosa (G. Merr.) Brodo & D. Hawksw. | BRTO2 |
| tube lichen | Hypogymnia (Nyl.) Nyl. | HYPOG2 |
| tube lichen | Hypogymnia austerodes (Nyl.) Rasanen | HYAU60 |
| tube lichen | Hypogymnia enteromorpha (Ach.) Nyl. | HYEN60 |
| tube lichen | Hypogymnia farinacea Zopf | HYFA3 |
| tube lichen | Hypogymnia heterophylla L. Pike | HYHE3 |
| tube lichen | Hypogymnia lugubris (Pers.) Krog | HYLU4 |
| tube lichen | Hypogymnia metaphysodes (Asah.) Rass. | HYME3 |
| tube lichen | Hypogymnia mollis L. Pike & Hale | HYMO5 |
| tube lichen | Hypogymnia physodes (L.) Nyl. | HYPH60 |
| tube lichen | Hypogymnia pulverata (Nyl. ex Crombie) Elix | HYPU6 |
| tube lichen | Hypogymnia rugosa (G. Merr.) L. Pike | HYRU3 |
| tube lichen | Hypogymnia subcapitata (Nyl.) Rass. | HYSU5 |
| tube lichen | Hypogymnia subobscura (Vainio) Poelt | HYSU60 |
| tube lichen | Hypogymnia tubulosa (Schaerer) Hav. | HYTU60 |
| Tuckerman's ragged lichen | Platismatia tuckermanii (Oakes) Culb. & C. Culb. | PLTU |
| Tuckermannopsis americana | Cetraria ciliaris Ach. var. halei (Culb. & C. Culb.) Ahti | CECIH2 |
| Tuckermannopsis americana | Cetraria halei Culb. & C. Culb. | CEHA |
| Tuckermannopsis americana | Tuckermannopsis halei (Culb. & C. Culb.) M. J. Lai | TUHA |
| Tuckermannopsis chlorophylla | Cetraria chlorophylla (Willd.) Vainio | CECH4 |
| Tuckermannopsis chlorophylla | Cetraria scutata auct. | CESC8 |
| Tuckermannopsis ciliaris | Cetraria ciliaris Ach. | CECI3 |
| Tuckermannopsis coralligera | Cetraria coralligera (W. A. Weber) Hale | CECO8 |
| Tuckermannopsis fendleri | Cetraria fendleri (Nyl.) Tuck. | CEFE3 |
| Tuckermannopsis inermis | Cetraria inermis (Nyl.) Krog | CEIN12 |
| tuckermannopsis lichen | Tuckermannopsis ciliaris (Ach.) Gyelnik | TUCI60 |
| tuckermannopsis lichen | Tuckermannopsis coralligera (W. A. Weber) W. A. Weber | TUCO3 |
| tuckermannopsis lichen | Tuckermannopsis Gyelnik | TUCKE2 |
| tuckermannopsis lichen | Tuckermannopsis orbata (Nyl.) M. J. Lai | TUOR60 |
| tuckermannopsis lichen | Tuckermannopsis playtphylla (Tuck.) Hale | TUPL |
| tuckermannopsis lichen | Tuckermannopsis sepincola (Ehrh.) Hale | TUSE60 |
| Tuckermannopsis orbata | Cetraria orbata (Nyl.) Fink | CEOR6 |
| Tuckermannopsis playtphylla | Cetraria platyphylla Tuck. | CEPL4 |
| Tuckermannopsis sepincola | Cetraria scutata (Wulfen) Poetsch | CESC7 |
| Tuckermannopsis sepincola | Cetraria sepincola (Ehrh.) Ach. | CESE7 |
| Tuckermannopsis subalpina | Cetraria arborealis (G. Merr.) Howard | CEAR9 |
| Tuckermannopsis subalpina | Cetraria subalpina Imshaug | CESU60 |
| Tuckermannopsis weberi | Cetraria weberi Essl. | CEWE |
| Tucson xanthoparmelia lichen | Xanthoparmelia tucsonensis (T. Nash) Egan | XATU |
| twocolor horsehair lichen | Bryoria bicolor (Ehrh.) Brodo & D. Hawksw. | BRBI60 |
| Usnea baileyi | Usnea antillarum (Vainio) Zahlbr. | USAN2 |
| Usnea baileyi | Usnea implicata (Stirton) Zahlbr. | USIM |
| Usnea cornuta | Usnea inflata Delise ex Duby | USIN2 |
| Usnea dasaea | Usnea spinulifera (Vainio) Mot. | USSP2 |
| Usnea filipendula | Usnea caucasica Vainio | USCA5 |
| Usnea filipendula | Usnea dasypoga auct. | USDA |
| Usnea filipendula | Usnea esthonica Rasanen | USES |
| Usnea filipendula | Usnea flagellata Mot. | USFL2 |
| Usnea filipendula | Usnea sublaxa Vainio | USSU61 |
| Usnea fragilescens var. mollis | Usnea mollis Stirton | USMO2 |
| Usnea glabrata | Usnea kujalae Rasanen | USKU |
| Usnea glabrata | Usnea sorediifera (Arnold) Lynge | USSO |
| Usnea glabrescens | Usnea betulina Mot. | USBE |
| Usnea glabrescens | Usnea compacta (Rasanen) Mot. | USCO5 |
| Usnea glabrescens | Usnea distincta Mot. | USDI3 |
| Usnea hirta | Usnea variolosa Mot. | USVA3 |
| Usnea lapponica | Usnea laracina Vainio ex Rasanen | USLA2 |
| Usnea lapponica | Usnea sorediifera sensu Mot. | USSO2 |
| Usnea perplectata | Usnea subcavata Mot. | USSU2 |
| Usnea scabrata | Usnea rugulosa Vainio | USRU3 |
| Usnea scabrata | Usnea scabrata Nyl. ssp. nylanderiana Mot. | USSCN |
| Usnea sphacelata | Neuropogon lambii Imshaug | NELA6 |
| Usnea sphacelata | Neuropogon sulphureus (J. Koenig) Hellbom | NESU3 |
| Usnea strigosa ssp. rubiginea | Usnea rubiginea (Michaux) A. Massal. | USRU2 |
| Usnea subfloridana | Usnea comosa auct. | USCO4 |
| Usnea subfloridana | Usnea similis Mot. ex Rasanen | USSI |
| Usnea xanthopoga | Usnea barbata (L.) F. H. Wigg. var. xanthopoga Mull. Arg. | USBAX |
| varigated beard lichen | Usnea variegata Stirton | USVA2 |
| Virginia hypotrachyna lichen | Hypotrachyna virginica (Hale) Hale | HYVI7 |
| Vitt tube lichen | Hypogymnia vittata (Ach.) Parrique | HYVI60 |
| Vulpicida canadensis | Cetraria canadensis (Rasanen) Rasanen | CECA16 |
| Vulpicida canadensis | Cetraria juniperina (L.) Ach. | CEJU |
| Vulpicida canadensis | Tuckermannopsis canadensis (Rasanen) Hale | TUCA2 |
| Vulpicida canadensis | Tuckermannopsis juniperina (L.) Hale | TUJU |
| Vulpicida pinastri | Cetraria pinastri (Scop.) Gray | CEPI4 |
| Vulpicida pinastri | Tuckermannopsis pinastri (Scop) Hale | TUPI60 |
| Vulpicida tilesii | Cetraria tilesii Ach. | CETI60 |
| Vulpicida viridis | Cetraria viridis Schwein | CEVI8 |
| Vulpicida viridis | Tuckermannopsis viridis (Schwein.) Hale | TUVI |
| Weber's xanthoparmelia lichen | Xanthoparmelia weberi (Hale) Hale | XAWE |
| western beard lichen | Usnea occidentalis Mot. | USOC |
| western neofuscelia lichen | Neofuscelia occidentalis (Essl.) Essl. | NEOC2 |
| western tube lichen | Hypogymnia occidentalis L. Pike | HYOC3 |
| Wirth's beard lichen | Usnea wirthii P. Clerc | USWI |
| wolf lichen | Letharia (Th. Fr.) Zahlbr. | LETHA |
| wolf lichen | Letharia columbiana (Nutt.) J. W. Thomson | LECO26 |
| wolf lichen | Letharia vulpina (L.) Hue | LEVU2 |
| Wyoming xanthoparmelia lichen | Xanthoparmelia wyomingica (Gyelnik) Hale | XAWY |
| Xanthoparmelia ajoensis | Parmelia ajoensis T. Nash | PAAJ |
| Xanthoparmelia angustiphylla | Parmelia hypopsila (Mull. Arg.) Hale | PAHY12 |
| Xanthoparmelia angustiphylla | Xanthoparmelia hypopsila (Mull. Arg.) Hale | XAHY3 |
| Xanthoparmelia chlorochroa | Parmelia chlorochroa Tuck. | PACH13 |
| Xanthoparmelia coloradoensis | Parmelia ioanis-simae Gyelnik | PAIO2 |
| Xanthoparmelia coloradoensis | Xanthoparmelia ioanis-simae (Gyelnik) Hale | XAIO |
| Xanthoparmelia conspersa | Parmelia conspersa (Ehrh. ex Ach.) Ach. | PACO40 |
| Xanthoparmelia conspersa | Parmelia isidiata (Anzi) Gyelnik | PAIS4 |
| Xanthoparmelia cumberlandia | Parmelia cumberlandia (Gyelnik) Hale | PACU6 |
| Xanthoparmelia dierythra | Parmelia dierythra Hale | PADI17 |
| Xanthoparmelia dierythra | Parmelia dissensa T. Nash | PADI22 |
| Xanthoparmelia huachucensis | Parmelia huachucensis T. Nash | PAHU5 |
| Xanthoparmelia hypomelaena | Parmelia hypomelaena Hale | PAHY11 |
| Xanthoparmelia joranadia | Parmelia joranadia T. Nash | PAJO4 |
| Xanthoparmelia lavicola | Parmelia kurokawae Hale | PAKU |
| Xanthoparmelia lavicola | Xanthoparmelia kurokawae (Hale) Hale | XAKU |
| xanthoparmelia lichen | Xanthoparmelia (Vainio) Hale | XANTH7 |
| xanthoparmelia lichen | Xanthoparmelia angustiphylla (Gyelnik) Hale | XAAN |
| xanthoparmelia lichen | Xanthoparmelia australasica D. J. Galloway | XAAU |
| xanthoparmelia lichen | Xanthoparmelia barbatica (Elix) Egan | XABA |
| xanthoparmelia lichen | Xanthoparmelia chlorochroa (Tuck.) Hale | XACH3 |
| xanthoparmelia lichen | Xanthoparmelia conspersa (Ehrh. ex Ach.) Hale | XACO6 |
| xanthoparmelia lichen | Xanthoparmelia dierythra (Hale) Hale | XADI2 |
| xanthoparmelia lichen | Xanthoparmelia dissensa (T. Nash) Hale | XADI3 |
| xanthoparmelia lichen | Xanthoparmelia hypomelaena (Hale) Hale | XAHY2 |
| xanthoparmelia lichen | Xanthoparmelia isidiascens Hale | XAIS |
| xanthoparmelia lichen | Xanthoparmelia joranadia (T. Nash) Hale | XAJO |
| xanthoparmelia lichen | Xanthoparmelia lavicola (Gyelnik) Hale | XALA2 |
| xanthoparmelia lichen | Xanthoparmelia lineola (E. C. Berry) Hale | XALI |
| xanthoparmelia lichen | Xanthoparmelia lipochlorochroa Hale & Elix | XALI2 |
| xanthoparmelia lichen | Xanthoparmelia monticola (J. P. Dey) Hale | XAMO3 |
| xanthoparmelia lichen | Xanthoparmelia neochlorochroa Hale | XANE |
| xanthoparmelia lichen | Xanthoparmelia neoconspersa (Gyelnik) Hale | XANE2 |
| xanthoparmelia lichen | Xanthoparmelia neotaractica Hale | XANE3 |
| xanthoparmelia lichen | Xanthoparmelia nigropsomifera (T. Nash) Egan | XANI2 |
| xanthoparmelia lichen | Xanthoparmelia norchlorochroa Hale | XANO |
| xanthoparmelia lichen | Xanthoparmelia norhypopsila Hale | XANO2 |
| xanthoparmelia lichen | Xanthoparmelia oleosa (Elix & P. M. Armstrong) Elix & T. Nash | XAOL2 |
| xanthoparmelia lichen | Xanthoparmelia planilobata (Gyelnik) Hale | XAPL |
| xanthoparmelia lichen | Xanthoparmelia psoromifera (Kurok.) Hale | XAPS |
| xanthoparmelia lichen | Xanthoparmelia somloensis (Gyelnik) Hale | XASO2 |
| xanthoparmelia lichen | Xanthoparmelia stenophylloides (Mull. Arg.) Hale | XAST3 |
| xanthoparmelia lichen | Xanthoparmelia subdecipiens (Vainio) Hale | XASU2 |
| xanthoparmelia lichen | Xanthoparmelia subramigera (Gyelnik) Hale | XASU3 |
| xanthoparmelia lichen | Xanthoparmelia substenophylloides Hale | XASU4 |
| xanthoparmelia lichen | Xanthoparmelia vagans (Nyl.) Hale | XAVA2 |
| Xanthoparmelia lineola | Parmelia lineola E. C. Berry | PALI12 |
| Xanthoparmelia mexicana | Parmelia mexicana Gyelnik | PAME13 |
| Xanthoparmelia monticola | Parmelia monticola J. P. Dey | PAMO14 |
| Xanthoparmelia mougeotii | Parmelia mougeotii Schaerer | PAMO16 |
| Xanthoparmelia neoconspersa | Parmelia neoconspersa Gyelnik | PANE12 |
| Xanthoparmelia nigropsomifera | Parmelia nigropsoromifera T. Nash | PANI6 |
| Xanthoparmelia novomexicana | Parmelia arseneana Gyelnik | PAAR13 |
| Xanthoparmelia novomexicana | Parmelia novomexicana Gyelnik | PANO4 |
| Xanthoparmelia novomexicana | Parmelia tuberculata Gyelnik | PATU4 |
| Xanthoparmelia novomexicana | Xanthoparmelia arseneana (Gyelnik) Hale | XAAR3 |
| Xanthoparmelia piedmontensis | Parmelia piedmontenis Hale | PAPI7 |
| Xanthoparmelia plittii | Parmelia plittii Gyelnik | PAPL9 |
| Xanthoparmelia psoromifera | Parmelia psoromifera Kurok. | PAPS9 |
| Xanthoparmelia somloensis | Parmelia stenophylla (Ach.) Du Rietz | PAST15 |
| Xanthoparmelia somloensis | Parmelia taractica Krempelh. | PATA2 |
| Xanthoparmelia somloensis | Xanthoparmelia taractica (Krempelh.) Hale | XATA60 |
| Xanthoparmelia subdecipiens | Parmelia subdecipiens Vainio | PASU18 |
| Xanthoparmelia subramigera | Parmelia subramigera Gyelnik | PASU27 |
| Xanthoparmelia tasmanica | Parmelia tasmanica Hook. f. & Taylor | PATA3 |
| Xanthoparmelia tucsonensis | Parmelia tucsonensis T. Nash | PATU6 |
| Xanthoparmelia weberi | Parmelia weberi Hale | PAWE6 |
| Xanthoparmelia wyomingica | Parmelia wyomingica (Gyelnik) Hale | PAWY |
| Zollinger's parmotrema lichen | Parmotrema zollingeri (Hepp) Hale | PAZO |