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829 ferns species
Botrychium pseudopinnatum
Pellaea bridgesii
Gymnocarpium jessoense
Botrychium pumicola
Pellaea andromedifolia
Polypodium saximontanum
Azolla cristata
Botrychium acuminatum
Adiantum jordanii
Botrychium mormo
Osmunda regalis
Botrychium tunux
Polystichum setiferum
Vittaria appalachiana
Dryopteris borreri
Pilularia americana
Psilotum nudum
Marsilea oligospora
Athyrium asplenioides
Polypodium californicum
Polystichum polyblepharon
Sphaeropteris cooperi
Salvinia minima
Athyrium cyclosorum
Marsilea mutica
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