Monographs Details: Hemidictyum
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 stout, erect; rhizome scales brown, clathrate, with golden brown lumina; fronds large, clumped, monomorphic; stipe stout, glabrous, green to brown; blade once-pinnate, apex conform, the pinnae oblong, glabrous; veins once-forked near base mostly, at nearly right angle to the costa, free near the costa, forming a network in marginal half of the lamina, without included veinlets, network closed at margin by intramarginal vein; sori linear, along main vein branches (between costa and first anastomosis), indusiate; spores bilateral, with perispore.
Discussion:Type: Hemidictyum marginatum (Linnaeus) Presl [=Asplenium marginatum Linnaeus].
Hemidictyum is a monotypic genus, the one species over most of tropical America. Some believe it to be related to Diplazium (athyrioid ferns), but the chromosome number of x = 31 is quite distinct from the 40 and 41 of that group. Hemidictyum is distinct by the large, once-pinnate fronds, thin texture, half-netted veins, and long, indusiate sori.