Monographs Details: Hypoderris
Authority: Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.
Description:Species Description - A tenestrial fem of small to moderate size. Rhizome slender, creeping, up to 15 cm long, 3-5 mm thick, densely scaly, the scales brown, subclathrate, lance-attenuate, up to 5 m m long. Fronds few, scattered, 30-85 cm long, stipitate; stipes dull purple-brown, densely clothed with scales like those of rhizome. Blades simple, subcordate to cordate, entire to hastate-lobate at base, often constricted above the lobes, acuminate at apex, with margins entire or sinuate; veins closely reticulate, the areoles with or without a short, included free veinlet; tissue glabrous, rather firmly chartaceous, dark green. Sori very numerous, small, roundish, scattered without regular pattem; indusium circular, sunounding a central receptacle and attached beneath sorus, shallowly lobed, fimbriate-ciliate, erect at first but at maturity appressed to frond-surface and hidden beneath the sporangia; paraphyses absent; sporangia with annulus of ca. 14 cells; spores ellipsoid to nearly spheroid, monolete, the surface densely cristate-echinate with prominent projections.
Type and Sole Species. Hypoderris brownii J. Smith of tropical America.
The generic name is derived from the Greek
hypo, below + derris, covering, because the sporangia
are at first under a calyx-like indusium.