Monographs Details: Didymochlaena
Authority: Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.
Description:Genus Description - Terrestrial; rhizome suberect to erect, scaly; fronds clumped, monomorphic, bipinnate; pinnules articulate, oblong, subdimidiate; veins free, forked, not reaching margin, hydathodes present; costae channelled, ridge with numerous awns (0.5-0.8 mm long) clustered at base of pinnules; sori terminal on veins, elongate, indusia elliptical, rounded at distal end, cordate or sagittate at base, fixed to vein along medial line; spores bilateral, perispore present, surface saccate or folded.
Discussion:Type: Didymochlaena sinuata Desvaux [=Didymochlaena truncatula (Swartz) J. Smith].
Didymochlaena is a monotypic genus, with the one species pantropical at low elevations. Precise relationships of the genus are not clear, but probably are aspidioid. It has been placed in a separate family by Ching (1940). Didymochlaena is distinguished by its oblong, entire, subdimidiate segments and oblong sori on both sides of the vein and continuous over the vein at the acro-scopic end.
Reference: Ching, R. C. 1940. On natural classification of the family “Polypodiaceae.” Sunyatsenia 5: 201-268.