| Common Name | Scientific Name | Code |
| n/a | Collema conglomeratum Hoffm. var. corynesporum (Malme) Degel. | COCOC7 |
| n/a | Collema cristatum (L.) F. H. Wigg. var. marginale (Hudson) Degel. | COCRM |
| n/a | Collema kauaiense H. Magn. | COKA3 |
| n/a | Collema tenax (Sw.) Ach. var. substellatum (H. Magn.) Degel. | COTES |
| n/a | Leptogium brebissonii Mont. | LEBR14 |
| n/a | Leptogium imbricatum P. M. Jorg. | LEIM5 |
| n/a | Leptogium intermedium (Arnold) Arnold | LEIN26 |
| n/a | Leptogium polycarpum P. M. Jorg. & Goward | LEPO19 |
| n/a | Leptogium schraderi (Ach.) Nyl. | LESC13 |
| n/a | Leptogium subaridum P. M. Jorg. & Goward | LESU42 |
| n/a | Leptogium subtile (Schrader) Torss. | LESU43 |
| Appalachian skin lichen | Leptogium appalachense Nyl. | LEAP4 |
| arctic skin lichen | Leptogium arcticum P. M. Jorg. | LEAR15 |
| Arsene's skin lichen | Leptogium arsenei Sierk | LEAR16 |
| Austroamerican skin lichen | Leptogium austroamericanum (Malme) C. W. Dodge | LEAU8 |
| Bachman's jelly lichen | Collema bachmanianum (Fink) Degel. | COBA8 |
| blue skin lichen | Leptogium azureum (Sw.) Mont. | LEAZ |
| Burgess's skin lichen | Leptogium burgessii (L.) Mont. | LEBU4 |
| Burnet's skin lichen | Leptogium burnetiae C. W. Dodge | LEBU5 |
| California skin lichen | Leptogium californicum Tuck. | LECA61 |
| cataract physma lichen | Physma cataractaecola de Lesd. | PHCA28 |
| Collema auriforme | Collema auriculatum Hoffm. | COAU9 |
| Collema auriforme | Collema granosum auct. | COGR16 |
| Collema bachmanianum | Collemodes bachmanianum Fink | COBA9 |
| Collema ceraniscum | Collema arcticum Lynge | COAR8 |
| Collema coccophorum | Collema dubium de Lesd. | CODU2 |
| Collema coccophorum | Collema novomexicanum de Lesd. | CONO3 |
| Collema conglomeratum | Collema ohioense (Fink) Zahlbr. | COOH |
| Collema conglomeratum var. crassiusculum | Collema cyrtaspis Tuck. | COCY6 |
| Collema conglomeratum var. crassiusculum | Collema pycnocarpum Nyl. | COPY4 |
| Collema conglomeratum var. crassiusculum | Synechoblastus pycnocarpus Nyl. | SYPY |
| Collema crispum | Collema cheileum (Ach.) Ach. | COCH6 |
| Collema dichotomum | Collema fluviatile (Hudson) Steudel | COFL11 |
| Collema dichotomum | Collema stenophyllum Nyl. | COST16 |
| Collema fasciculare | Synechoblastus aggregatus (Ach.) Th. Fr. | SYAG |
| Collema flaccidum | Synechoblastus rupestris (Sw.) Trevisan | SYRU4 |
| Collema fragrans | Collema microphyllum Ach. | COMI10 |
| Collema furfuraceum var. luzonense | Collema subfurfuraceum Degel. | COSU14 |
| Collema fuscovirens | Collema furvum (Ach.) Ach. | COFU5 |
| Collema fuscovirens | Collema tuniforme (Ach.) Ach. | COTU4 |
| Collema leptaleum | Collema microptychium Tuck. | COMI11 |
| Collema limosum | Collema glaucescens Hoffm. | COGL15 |
| Collema polycarpon | Synechoblastus polycarpus (Hoffm.) Dalla Torre & Sarnth. | SYPO3 |
| Collema polycarpon | Synechoblastus wyomingensis Fink | SYWY |
| Collema pulchellum var. leucopeplum | Collema leucopeplum (Tuck.) A. Schneider | COLE7 |
| Collema pustulatum | Collema fayettense Fink | COFA5 |
| Collema subflaccidum | Collema subfurvum sensu Degel. | COSU15 |
| Collema tenax | Collema cristatellum Tuck. | COCR9 |
| Collema tenax | Collema pulposum (Bernh.) Ach. | COPU17 |
| Collema texanum | Collema laciniatum Nyl. | COLA13 |
| Collema texanum | Collema nylanderianum Zahlbr. | CONY2 |
| Collema texanum | Synechoblastus texanus (Tuck.) Mull. Arg. | SYTE4 |
| conglomerate jelly lichen | Collema conglomeratum Hoffm. | COCO26 |
| conglomerate jelly lichen | Collema conglomeratum Hoffm. var. crassiusculum (Malme) Degel. | COCOC4 |
| contorted skin lichen | Leptogium contortum Sierk | LECO23 |
| coral jelly lichen | Collema tenax (Sw.) Ach. var. corallinum (A. Massal.) Degel. | COTEC4 |
| crenate skin lichen | Leptogium crenatulum (Nyl.) Vainio | LECR6 |
| crusty jelly lichen | Collema tenax (Sw.) Ach. var. crustaceum (Krempelh.) Degel. | COTEC5 |
| erect skin lichen | Leptogium erectum Sierk | LEER5 |
| fecund jelly lichen | Collema fecundum Degel. | COFE4 |
| finger skin lichen | Leptogium digitatum (A. Massal.) Zahlbr. | LEDI15 |
| Finmark's leciophysma lichen | Leciophysma finmarkicum Th. Fr. | LEFI6 |
| Florida skin lichen | Leptogium floridanum Sierk | LEFL12 |
| forked jelly lichen | Collema dichotomum (With.) Coppins & J. R. Laundon | CODI13 |
| gelatinous skin lichen | Leptogium gelatinosum (With.) J. R. Laundon | LEGE60 |
| hairy skin lichen | Leptogium hirsutum Sierk | LEHI60 |
| jelly lichen | Collema auriforme (With.) Coppins & J. R. Laundon | COAU8 |
| jelly lichen | Collema callibotrys Tuck. | COCA34 |
| jelly lichen | Collema callopismum A. Massal. | COCA35 |
| jelly lichen | Collema callopismum Massal var. rhyparodes (Nyl.) Degel. | COCAR |
| jelly lichen | Collema ceraniscum Nyl. | COCE |
| jelly lichen | Collema coccophorum Tuck. | COCO25 |
| jelly lichen | Collema crispum (Hudson) Weber ex F. H. Wigg. | COCR6 |
| jelly lichen | Collema cristatum (L.) F. H. Wigg. | COCR7 |
| jelly lichen | Collema curtisporum Degel. | COCU5 |
| jelly lichen | Collema F. H. Wigg | COLLE2 |
| jelly lichen | Collema fasciculare (L.) F. H. Wigg. | COFA4 |
| jelly lichen | Collema flaccidum (Ach.) Ach. | COFL7 |
| jelly lichen | Collema fragrans (Sm.) Ach. | COFR8 |
| jelly lichen | Collema furfuraceum (Arnold) Du Rietz | COFU3 |
| jelly lichen | Collema fuscovirens (With.) J. R. Laundon | COFU60 |
| jelly lichen | Collema glebulentum (Nyl. ex Crombie) Degel. | COGL14 |
| jelly lichen | Collema leptaleum Tuck. | COLE6 |
| jelly lichen | Collema limosum (Ach.) Ach. | COLI14 |
| jelly lichen | Collema multipartitum Sm. | COMU61 |
| jelly lichen | Collema nigrescens (Hudson) DC. | CONI8 |
| jelly lichen | Collema polycarpon Hoffm. | COPO6 |
| jelly lichen | Collema pulchellum Ach. | COPU19 |
| jelly lichen | Collema pulchellum Ach. var. leucopeplum (Tuck.) Degel. | COPUL |
| jelly lichen | Collema pulchellum Ach. var. subnigrescens (Mull. Arg.) Degel. | COPUS2 |
| jelly lichen | Collema pustulatum Ach. | COPU16 |
| jelly lichen | Collema ryssoleum (Tuck.) A. Schneider | CORY60 |
| jelly lichen | Collema subflaccidum Degel. | COSU11 |
| jelly lichen | Collema subnigrescens Degel. | COSU12 |
| jelly lichen | Collema subparvum Degel. | COSU13 |
| jelly lichen | Collema tenax (Sw.) Ach. | COTE60 |
| jelly lichen | Collema tenax (Sw.) Ach. var. ceranoides (Borrer) Degel. | COTEC3 |
| jelly lichen | Collema thamnodes Riddle | COTH |
| juniper skin lichen | Leptogium juniperinum Tuck. | LEJU2 |
| leciophysma lichen | Leciophysma furfurascens (Nyl.) Gyelnik | LEFU12 |
| leciophysma lichen | Leciophysma Th. Fr. | LECIO2 |
| Leptogium burgessii | Leptogium inflexum Nyl. | LEIN14 |
| Leptogium byssinum | Leptogium amphineum Ach. ex Nyl. | LEAM9 |
| Leptogium byssinum | Leptogium caesiellum Tuck. | LECA51 |
| Leptogium corniculatum | Leptogium palmatulum (Hudson) Mont. | LEPA36 |
| Leptogium cyanescens | Leptogium caesium (Ach.) Vainio | LECA52 |
| Leptogium cyanescens | Leptogium tremelloides auct. | LETR10 |
| Leptogium furfuraceum | Leptogium papillosum (de Lesd.) C. W. Dodge | LEPA43 |
| Leptogium gelatinosum | Leptogium sinuatum (Hudson) A. Massal. | LESI7 |
| Leptogium hirsutum | Leptogium burnetiae Dodge var. hirsutum (Sierk) P. M. Jorg. | LEBUH2 |
| Leptogium juniperinum | Leptogium arizonicum Zahlbr. | LEAR25 |
| Leptogium juniperinum | Leptogium plectenchymum Fink | LEPL12 |
| Leptogium laceroides | Leptogium americanum Degel. | LEAM8 |
| Leptogium plicatile | Collema plicatile (Ach.) Ach. | COPL3 |
| Leptogium rivale | Polychidium rivale (Tuck.) Fink | PORI6 |
| Leptogium rivulare | Leptogium crenatellum (Nyl.) Tuck. | LECR10 |
| Leptogium subtile | Leptogium minutissimum (Florke) Fr. | LEMI21 |
| Leptogium tenuissimum | Leptogium lividofuscum (Florke ex Schlecht.) Flotow | LELI12 |
| Leptogium tenuissimum | Leptogium nanum Herre | LENA5 |
| Leptogium tenuissimum | Leptogium perminutum Fink | LEPE21 |
| Luzon jelly lichen | Collema furfuraceum (Arnold) Du Rietz var. luzonense (Rasanen) Degel. | COFUL |
| occult jelly lichen | Collema occultatum Bagl. | COOC8 |
| physma lichen | Physma A. Massal. | PHYSM |
| physma lichen | Physma byrsaeum (Ach.) Mull. Arg. | PHBY |
| rugose skin lichen | Leptogium rugosum Sierk | LERU10 |
| Saturn skin lichen | Leptogium saturninum (Dickson) Nyl. | LESA60 |
| sessile skin lichen | Leptogium sessile Vainio | LESE10 |
| skin lichen | Leptogium (Ach.) Gray | LEPTO14 |
| skin lichen | Leptogium adpressum Nyl. | LEAD2 |
| skin lichen | Leptogium byssinum (Hoffm.) Zwackh ex Nyl. | LEBY |
| skin lichen | Leptogium chloromelum (Sw. ex Ach.) Nyl. | LECH11 |
| skin lichen | Leptogium corniculatum (Hoffm.) Minks | LECO61 |
| skin lichen | Leptogium corticola (Taylor) Tuck. | LECO24 |
| skin lichen | Leptogium cyanescens (Rabenh.) Korber | LECY60 |
| skin lichen | Leptogium dactylinum Tuck. | LEDA5 |
| skin lichen | Leptogium furfuraceum (Harm.) Sierk | LEFU13 |
| skin lichen | Leptogium fusisporum (Tuck.) C. W. Dodge | LEFU14 |
| skin lichen | Leptogium hypotrachynum Mull. Arg. | LEHY9 |
| skin lichen | Leptogium isidiosellum (Riddle) Sierk | LEIS2 |
| skin lichen | Leptogium laceroides (de Lesd.) P. M. Jorg. | LELA18 |
| skin lichen | Leptogium lichenoides (L.) Zahlbr. | LELI60 |
| skin lichen | Leptogium marginellum (Sw.) Gray | LEMA16 |
| skin lichen | Leptogium microstictum Vainio | LEMI19 |
| skin lichen | Leptogium milligranum Sierk | LEMI20 |
| skin lichen | Leptogium parculum Nyl. | LEPA24 |
| skin lichen | Leptogium phyllocarpum (Pers.) Mont. | LEPH5 |
| skin lichen | Leptogium platynum (Tuck.) Herre | LEPL7 |
| skin lichen | Leptogium plicatile (Ach.) Leighton | LEPL8 |
| skin lichen | Leptogium rivale Tuck. | LERI2 |
| skin lichen | Leptogium rivulare (Ach.) Mont. | LERI3 |
| skin lichen | Leptogium tenuissimum (Dickson) Korber | LETE12 |
| stipitate skin lichen | Leptogium stipitatum Vainio | LEST15 |
| terete skin lichen | Leptogium teretiusculum (Wallr.) Arnold | LETE13 |
| Texas jelly lichen | Collema texanum Tuck. | COTE14 |
| toothed skin lichen | Leptogium denticulatum Tuck. | LEDE13 |
| undulate jelly lichen | Collema undulatum Laurer ex Flotow | COUN60 |
| undulate jelly lichen | Collema undulatum Laurer ex Flotow var. granulosum Degel. | COUNG |