Prosaptia, C. Presl, 1836

Parris, Barbara, Chen, Cheng Wei, Hsu, Tian Chuan, Lu, Thi Ngan, Nguyen, Quoc Dat & Luu, Hong Truong, 2015, New species and records of grammitid ferns (Polypodiaceae) for Vietnam, Phytotaxa 226 (1), pp. 39-50 : 48

Prosaptia

1a Sori in pits opening at or near margin, lamina margin forming part of pit mouth ........................................................................... 2 2a Rachis wing 10–40 mm wide ........................................................................................................................................... P. alata 2b Rachis wing less than 5 mm wide .............................................................................................................................. P. pectinata 1b Sori in pits perpendicular to lamina surface, pit mouth entirely on abaxial surface of lamina ........................................................ 3

3a Soral pits without prominent rim ............................................................................................................... P. barathrophylla

3b Soral pits with prominent rim ............................................................................................................................................... 4

4a Soral pits ± circular to elliptic, rim higher on side nearest costa ................................................................ P. intermedia

4b Soral pits elliptic to narrowly elliptic, rim of even height ............................................................................ P. obliquata