| Common Name | Scientific Name | Code |
| n/a | Asplenium ?alternifolium Wulfen (pro sp.) [septentrionale ? trichomanes] | ASAL10 |
| n/a | Asplenium ?biscaynianum (D.C. Eat.) A.A. Eat. (pro sp.) [myriophyllum ? trichomanes-dentatum] | ASBI3 |
| n/a | Asplenium ?boydstoniae (Walt.) Short [?ebenoides ? platyneuron] | ASBO6 |
| n/a | Asplenium ?clermontiae Syme [ruta-muraria ? trichomanes] | ASCL3 |
| n/a | Asplenium ?curtissii Underwood (pro sp.) [abscissum ? myriophyllum] | ASCU7 |
| n/a | Asplenium ?ebenoides R.R. Scott (pro sp.) [platyneuron ? rhizophyllum] | ASEB |
| n/a | Asplenium ?flagrum W.H. Wagner & D.D. Palmer [hobdyi ? normale] | ASFL7 |
| n/a | Asplenium ?gravesii Maxon (pro sp.) [bradleyi ? pinnatifidum] | ASGR5 |
| n/a | Asplenium ?herb-wagneri W.C. Taylor & Mohlenbrock [pinnatifidum ? trichomanes] | ASHE2 |
| n/a | Asplenium ?heteroresiliens W.H. Wagner (pro sp.) [heterochroum ? resiliens] | ASHE4 |
| n/a | Asplenium ?inexpectatum (E.L. Braun ex Friesner) Morton [rhizophyllum ? ruta-muraria] | ASIN10 |
| n/a | Asplenium ?kentuckiense T.N. McCoy (pro sp.) [pinnatifidum ? platyneuron] | ASKE2 |
| n/a | Asplenium ?kokeense W.H. Wagner [aethiopicum ? cookii] | ASKO3 |
| n/a | Asplenium ?morganii W.H. Wagner [platyneuron ? ruta-muraria] | ASMO16 |
| n/a | Asplenium ?shawneense (R.C. Moran) H.E. Ballard [rhizophyllum ? trichomanes] | ASSH6 |
| n/a | Asplenium ?sphenocookii W.H. Wagner [cookii ? insiticium] | ASSP19 |
| n/a | Asplenium ?trudellii Wherry (pro sp.) [montanum ? pinnatifidum] | ASTR11 |
| n/a | Asplenium ?virginicum Maxon [platyneuron ? trichomanes] | ASVI7 |
| n/a | Asplenium ?waikomoi W.H. Wagner & D.D. Palmer [acuminatum ? aethiopicum] | ASWA9 |
| n/a | Asplenium ?wherryi D.M. Sm. [bradleyi ? montanum] | ASWH2 |
| n/a | Asplenium fragile K. Presl [excluded] | ASFR14 |
| n/a | Asplenium multifidum Brack. | ASMU8 |
| n/a | Diellia ?lauii W.H. Wagner [falcata ? unisora] | DILA24 |
| n/a | Diellia pumila Brack. [excluded] | DIPU8 |
| n/a | Dryopteris davallioides (Brack.) Kuntze | DRDA5 |
| n/a | Lomagramma cordipinna Holttum | LOCO18 |
| Antilles spleenwort | Asplenium pseudoerectum Hieron. | ASPS2 |
| Asplenium ?boydstoniae | ?Asplenosorus boydstoniae Walt. | ASBO8 |
| Asplenium ?curtissii | Asplenium scalifolium E. St. John ex Small | ASSC13 |
| Asplenium ?curtissii | Asplenium subtile E. St. John | ASSU14 |
| Asplenium ?ebenoides | ?Asplenosorus ebenoides (R.R. Scott) Wherry | ASEB2 |
| Asplenium ?gravesii | ?Asplenosorus gravesii (Maxon) Mickel | ASGR9 |
| Asplenium ?herb-wagneri | ?Asplenosorus herb-wagneri (W.C. Taylor & Mohlenbrock) Mickel | ASHE11 |
| Asplenium ?inexpectatum | ?Asplenosorus inexpectatus E.L. Braun ex Friesner | ASIN21 |
| Asplenium ?kentuckiense | ?Asplenosorus kentuckiensis (T.N. McCoy) Mickel | ASKE3 |
| Asplenium ?shawneense | ?Asplenosorus shawneensis R.C. Moran | ASSH9 |
| Asplenium ?trudellii | ?Asplenosorus trudellii (Wherry) Mickel | ASTR13 |
| Asplenium ?trudellii | Asplenium pinnatifidum Nutt. var. trudellii (Wherry) Clute | ASPIT |
| Asplenium ?virginicum | Asplenium ?mixtum Maxon | ASMI17 |
| Asplenium acuminatum | Asplenium goldmanii Underwood | ASGO2 |
| Asplenium adiantum-nigrum | Asplenium andrewsii A. Nels. | ASAN9 |
| Asplenium aethiopicum | Asplenium furcatum auct. non Thunb. [misapplied] | ASFU4 |
| Asplenium aethiopicum | Asplenium praemorsum Sw. | ASPR16 |
| Asplenium aethiopicum | Asplenium rhipidoneuron B.L. Robins. | ASRH |
| Asplenium bradleyi | Asplenium ?stotleri Wherry | ASST7 |
| Asplenium cirrhatum | Asplenium radicans L. var. cirrhatum (L.C. Rich. ex Willd.) Rosenst. | ASRAC |
| Asplenium dalhousiae | Ceterach dalhousiae (Hook.) C. Christens. | CEDA2 |
| Asplenium erosum | Asplenium auritum Sw. | ASAU3 |
| Asplenium erosum | Asplenium auritum Sw. var. auritum Sw. [superfluous autonym] | ASAUA |
| Asplenium erosum | Asplenium auritum Sw. var. bipinnatifidum Kunze | ASAUB |
| Asplenium exiguum | Asplenium fontanum (L.) Bernh. | ASFO6 |
| Asplenium exiguum | Asplenium glenniei Baker | ASGL6 |
| Asplenium feei | Asplenium sanguinolentum Kunze ex Mett. | ASSA15 |
| Asplenium flabellulatum | Asplenium radicans L. var. partitum (Klotzsch) Hieron. | ASRAP |
| Asplenium insiticium | Asplenium sphenotomum Hbd. | ASSP8 |
| Asplenium juglandifolium | Asplenium integerrimum Spreng. | ASIN16 |
| Asplenium kaulfussii | Asplenium enatum Brack. | ASEN5 |
| Asplenium kaulfussii | Asplenium gemmiferum Schrad. var. enatum (Brack.) O.& I. Deg. | ASGEE |
| Asplenium kaulfussii | Asplenium gemmiferum Schrad. var. flexuosum (Schrad.) Sims | ASGEF |
| Asplenium kaulfussii | Asplenium lydgatei Hbd. | ASLY2 |
| Asplenium kaulfussii | Asplenium meiotomum Hbd. | ASME3 |
| Asplenium macraei | Asplenium sphenolobum Zenker | ASSP14 |
| Asplenium macraei | Asplenium sphenolobum Zenker var. diplaziosorum Hieron. | ASSPD |
| Asplenium normale | Asplenium pavonicum Brack. | ASPA22 |
| Asplenium pinnatifidum | ?Asplenosorus pinnatifidus (Nutt.) Mickel | ASPI9 |
| Asplenium platyneuron var. platyneuron | Asplenium platyneuron (L.) B.S.P. var. incisum (Howe ex Peck) B.L. Robins. | ASPLI |
| Asplenium polyodon var. knudsenii | Asplenium knudsenii Hbd. | ASKN2 |
| Asplenium polyodon var. nitidulum | Asplenium falcatum auct. non Lam. [misapplied] | ASFA8 |
| Asplenium polyodon var. nitidulum | Asplenium nitidulum Hbd., non Moore | ASNI5 |
| Asplenium pumilum | Asplenium anthriscifolium Jacq. | ASAN10 |
| Asplenium pumilum | Asplenium pumilum Sw. var. anthriscifolium (Jacq.) Wherry | ASPUA |
| Asplenium radicans | Asplenium alloeopteron Kunze ex Klotzsch | ASAL12 |
| Asplenium radicans | Asplenium crytopteron Kunze | ASCR9 |
| Asplenium rhizophyllum | Camptosorus rhizophyllus (L.) Link | CARH8 |
| Asplenium rhomboidale | Asplenium sintenisii Hieron. | ASSI6 |
| Asplenium rhomboideum | Asplenium fragile K. Presl var. insulare Morton | ASFRI |
| Asplenium ruta-muraria var. cryptolepis | Asplenium cryptolepis Fern. | ASCR10 |
| Asplenium ruta-muraria var. lanceolum | Asplenium cryptolepis Fern. var. ohionis Fern. | ASCRO |
| Asplenium ruta-muraria var. lanceolum | Asplenium ruta-muraria L. var. ohionis (Fern.) Wherry | ASRUO |
| Asplenium ruta-muraria var. lanceolum | Asplenium ruta-muraria L. var. subtenuifolium auct. non Christ [misapplied] | ASRUS2 |
| Asplenium schizophyllum | Asplenium nephelephyllum Copeland | ASNE9 |
| Asplenium scolopendrium var. americanum | Phyllitis japonica Komarov ssp. americana (Fern.) A.& D. L?ve | PHJAA |
| Asplenium scolopendrium var. americanum | Phyllitis scolopendrium (L.) Newman var. americana Fern. | PHSCA |
| Asplenium trichomanes ssp. densum | Asplenium densum Brack. | ASDE7 |
| Asplenium trichomanes-dentatum | Asplenium dentatum L. | ASDE14 |
| Asplenium trichomanes-ramosum | Asplenium viride Huds. | ASVI10 |
| Asplenium uniseriale | Asplenium radicans L. var. uniseriale (Raddi) L.D. Gomez | ASRAU |
| Asplenium verecundum | Asplenium myriophyllum auct. non (Sw.) K. Presl [misapplied] | ASMY |
| bicolored spleenwort | Asplenium heterochroum Kunze | ASHE3 |
| birdnest fern | Asplenium polyodon G. Forst. var. nitidulum (Skottsberg) Morton | ASPON |
| birdnest fern | Asplenium polyodon G. Forst. var. sectum (Hbd.) Morton | ASPOS |
| birdnest fern | Asplenium polyodon G. Forst. var. subcaudatum (Skottsberg) Morton | ASPOS2 |
| black spleenwort | Asplenium adiantum-nigrum L. | ASAD |
| blackstem spleenwort | Asplenium resiliens Kunze | ASRE |
| bluntleaf spleenwort | Asplenium obtusifolium L. | ASOB5 |
| Bradley's spleenwort | Asplenium bradleyi D.C. Eat. | ASBR2 |
| brightgreen spleenwort | Asplenium trichomanes-ramosum L. | ASTR10 |
| brownstem spleenwort | Asplenium laetum Sw. | ASLA10 |
| Caribbean spleenwort | Asplenium rhomboidale Desv. | ASRH4 |
| chestnut scale spleenwort | Asplenium cirrhatum L.C. Rich. ex Willd. | ASCI6 |
| Cook's spleenwort | Asplenium cookii Copeland | ASCO59 |
| Countess Dalhousie's spleenwort | Asplenium dalhousiae Hook. | ASDA |
| creeping spleenwort | Asplenium serra Langsd. & Fisch. | ASSE8 |
| cutleaf island spleenwort | Diellia laciniata (Hbd.) Diels | DILA7 |
| cutleaf spleenwort | Asplenium abscissum Willd. | ASAB2 |
| dense spleenwort | Asplenium trichomanes L. ssp. densum (Brack.) W.H. Wagner | ASTRD3 |
| diamond spleenwort | Asplenium rhomboideum Brack. | ASRH3 |
| Diellia leucostegioides | Asplenium leucostegioides Baker | ASLE22 |
| dullgreen spleenwort | Asplenium radicans L. | ASRA6 |
| dwarf spleenwort | Asplenium pumilum Sw. | ASPU10 |
| eared spleenwort | Asplenium erosum L. | ASER9 |
| ebony spleenwort | Asplenium platyneuron (L.) B.S.P. | ASPL |
| ebony spleenwort | Asplenium platyneuron (L.) B.S.P. var. bacculum-rubrum (Featherman) Fern. | ASPLB |
| ebony spleenwort | Asplenium platyneuron (L.) B.S.P. var. platyneuron | ASPLP |
| Egyptian spleenwort | Asplenium aethiopicum (N.L. Burm.) Becherer | ASAE2 |
| erect island spleenwort | Diellia erecta Brack. | DIER3 |
| Fee's spleenwort | Asplenium feei Kunze ex F | ASFE3 |
| forest spleenwort | Asplenium contiguum Kaulfuss | ASCO14 |
| forest spleenwort | Asplenium contiguum Kaulfuss var. contiguum | ASCOC4 |
| forest spleenwort | Asplenium contiguum Kaulfuss var. hirtulum C. Christens. | ASCOH |
| forked spleenwort | Asplenium septentrionale (L.) Hoffmann | ASSE |
| fringed spleenwort | Asplenium schizophyllum C. Christens. | ASSC8 |
| Haleakala spleenwort | Asplenium haleakalense W.H. Wagner | ASHA14 |
| Hart's tonguefern | Asplenium scolopendrium L. | ASSC11 |
| Hart's tonguefern | Asplenium scolopendrium L. var. americanum (Fern.) Kartesz & Gandhi | ASSCA |
| Hawai'I birdnest fern | Asplenium nidus L. | ASNI |
| Hispaniolan spleenwort | Asplenium sessilifolium Desv. | ASSE11 |
| Hobdy's spleenwort | Asplenium hobdyi W.H. Wagner | ASHO8 |
| island spleenwort | Diellia Brack. | DIELL |
| Kaulfuss's spleenwort | Asplenium kaulfussii Schlecht. | ASKA |
| Knudsen's birdnest fern | Asplenium polyodon G. Forst. var. knudsenii (Hbd.) Morton | ASPOK |
| lacy spleenwort | Asplenium horridum Kaulfuss | ASHO4 |
| lance asplenium | Asplenium ruta-muraria L. var. lanceolum Christ | ASRUL |
| Latin American spleenwort | Asplenium flabellulatum Kunze | ASFL4 |
| limestone spleenwort | Asplenium verecundum Chapman ex Underwood | ASVE6 |
| little spleenwort | Asplenium exiguum Bedd. | ASEX2 |
| lobed spleenwort | Asplenium pinnatifidum Nutt. | ASPI |
| MaCrae's spleenwort | Asplenium macraei Hook. & Grev. | ASMA7 |
| maidenhair spleenwort | Asplenium trichomanes L. | ASTR2 |
| maidenhair spleenwort | Asplenium trichomanes L. ssp. quadrivalens D.E. Mey. | ASTRQ |
| maidenhair spleenwort | Asplenium trichomanes L. ssp. trichomanes | ASTRT |
| Mann's island spleenwort | Diellia mannii (D.C. Eat.) Robins. | DIMA3 |
| mountain spleenwort | Asplenium montanum Willd. | ASMO2 |
| necklace island spleenwort | Diellia leucostegioides (Baker) W.H. Wagner | DILE9 |
| Neobrackenridge's spleenwort | Asplenium neobrackenridgei W.H. Wagner | ASNE10 |
| pale island spleenwort | Diellia pallida W.H. Wagner | DIPA25 |
| Palmer's spleenwort | Asplenium palmeri Maxon | ASPA |
| pamohe | Asplenium unilaterale Lam. | ASUN |
| parsley spleenwort | Asplenium cristatum Lam. | ASCR6 |
| piipiilau manamana | Asplenium lobulatum Mett. | ASLO5 |
| rainforest spleenwort | Asplenium normale D. Don | ASNO4 |
| Rio Abajo spleenwort | Asplenium corderoanum Proctor | ASCO35 |
| rockledge spleenwort | Asplenium ocoense C. Christens. | ASOC2 |
| royal spleenwort | Asplenium insiticium Brack. | ASIN11 |
| rue spleenwort | Asplenium rutaceum (Willd.) Mett. | ASRU5 |
| ruffled spleenwort | Asplenium plenum E. St. John ex Small | ASPL10 |
| shinystem spleenwort | Asplenium uniseriale Raddi | ASUN5 |
| showy spleenwort | Asplenium formosum Willd. | ASFO2 |
| sickle island spleenwort | Diellia falcata Brack. | DIFA |
| sickle speenwort | Asplenium polyodon G. Forst. | ASPO4 |
| singlesorus island spleenwort | Diellia unisora W.H. Wagner | DIUN3 |
| singlesorus spleenwort | Asplenium monanthes L. | ASMO |
| speenwort | Asplenium caudatum G. Forst. | ASCA41 |
| spleenwort | Asplenium L. | ASPLE |
| spreading spleenwort | Asplenium patens Kaulfuss | ASPA17 |
| tapertip spleenwort | Asplenium acuminatum Hook. & Arn. | ASAC4 |
| toothed spleenwort | Asplenium trichomanes-dentatum L. | ASTR9 |
| treetrunk spleenwort | Asplenium auriculatum Sw. | ASAU2 |
| variable spleenwort | Asplenium varians Wallich ex Hook. & Grev. | ASVA4 |
| walking fern | Asplenium rhizophyllum L. | ASRH2 |
| wallrue | Asplenium ruta-muraria L. | ASRU2 |
| wallrue | Asplenium ruta-muraria L. var. cryptolepis (Fern.) Wherry | ASRUC |
| walnut spleenwort | Asplenium juglandifolium Lam. | ASJU2 |
| wedgeleaf spleenwort | Asplenium cuneatum Lam. | ASCU6 |
| West Indian spleenwort | Asplenium pteropus Kaulfuss | ASPT3 |
| western spleenwort | Asplenium vespertinum Maxon | ASVE3 |
| wild birdnest fern | Asplenium serratum L. | ASSE9 |
| willowleaf spleenwort | Asplenium salicifolium L. | ASSA6 |