Calymmodon

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

Calymmodon

1a Lamina setae 0.2–1.5 mm long .......................................................................................................................................... C. gracilis

1b Lamina setae and/or branched hairs 0.1–0.2 mm long ..................................................................................................................... 2

2a Sterile pinnae narrowly oblong to narrowly oblanceolate; uppermost sterile pinnae often longer than lowermost fertile pinnae ........................................................................................................................................................................................... ................................................................................................................................................................................... C. asiaticus

2b Sterile pinnae broadly triangular to broadly oblanceolate, uppermost sterile pinnae shorter than lowermost fertile pinnae ..... ................................................................................................................................................................................ C. concinnus