Pronephrium is a genus of ferns in the family Thelypteridaceae, subfamily Thelypteridoideae, in the Pteridophyte Phylogeny Group classification of 2016 (PPG I). Other sources sink Pronephrium into a very broadly defined genus Thelypteris. Some species were split off into the genera Abacopteris, Grypothrix and Menisciopsis in 2021 as a result of a phylogenetic study of the family Thelypteridaceae.
The genus was first described in 1851 by Carl Borivoj Presl.
Species , the Checklist of Ferns and Lycophytes of the World accepted the following species and hybrids:
Pronephrium affine (Blume) C.Presl Pronephrium amboinense (Willd.) Holttum Pronephrium amphitrichum Holttum Pronephrium aoristisorum (Harr.) S.E.Fawc. & A.R.Sm. Pronephrium aquatiloides (Copel.) Holttum Pronephrium borneense (Hook.) Holttum Pronephrium camarinense (Holttum) S.E.Fawc. & A.R.Sm. Pronephrium celebicum (Baker) Holttum Pronephrium clemensiae (Copel.) Holttum Pronephrium euryphyllum (Rosenst.) Holttum Pronephrium exsculptum (Baker) Holttum Pronephrium fidelei Rakotondr. Pronephrium firmulum (Baker) Holttum Pronephrium giluwense Holttum Pronephrium granulosum (C.Presl) Holttum Pronephrium hewittii (Copel.) Holttum Pronephrium hosei (Baker) Holttum Pronephrium inaequilobatum (Holttum) S.E.Fawc. & A.R.Sm. Pronephrium kjellbergii Holttum Pronephrium lineatum (Blume) C.Presl Pronephrium manuselense M.Kato Pronephrium marojejyensis Rakotondr. Pronephrium menisciicarpon (Blume) Holttum Pronephrium merrillii (Christ) Holttum Pronephrium millarae Holttum Pronephrium minahassae Holttum Pronephrium moniliforme (Tagawa & K.Iwats.) Holttum Pronephrium murkelense (M.Kato) S.E.Fawc. & A.R.Sm. Pronephrium nervosum (Fee) S.E.Fawc. & A.R.Sm. Pronephrium palauense (Hosok.) Holttum Pronephrium peltatum (Alderw.) Holttum Pronephrium peramalense Holttum Pronephrium philippinum (C.Presl) S.E.Fawc. & A.R.Sm. Pronephrium rhombeum (Christ) Holttum Pronephrium samarense (Copel.) Holttum Pronephrium simillimum (C.Chr.) Holttum Pronephrium solsonicum Holttum Pronephrium thysanoides Holttum Pronephrium trachyphyllum Holttum Pronephrium xiphioides (Christ) Holttum
Hybrids Pronephrium × interruptum Holttum Pronephrium × liukiuense (Christ) Nakaike Pronephrium × occultum (C.Hope) comb.ined.
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