Monographs Details: Trichomanes membranaceum L.
Authority: Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.
Family:Hymenophyllaceae
Description:Species Description - Plants colonial, often forming dense mats with imbricate fronds; rhizome filiform, densely clothed with dark brown, hairlike rhizoids. Fronds distantly attached, subsessile, dark green, pellucid. Blades extremely variable in shape, roundish to cuneate-oblong, linear, or inegularly obovate, often coarsely cleft, the margin subentire to deeply lacerate-toothed; veins numerous, close, repeatedly forked, the tissue between containing slender, elongate, nonconnected false veins, these bearing at the marginal end opposing pairs of tiny roundish scales, these deciduous with age. Sori when present mostly apical; involucre immersed, narrowly cylindric, terminating in abruptly flaring free lips.

Discussion:

Type. LINN 1253.1, from "America" without exact locality. Linnaeus also cited Sloane and Plumier references pertaining to material from Jamaica and Hispaniola.

Syn. Lecanium membranaceum (Linnaeus) K. Presl, Abh. Konigl. Bohm. Ges. Wiss. ser. 5, 3: 104, t. 1. 1843.

Hemiphlebium membranaceum (Linnaeus) Prantl, Unters. Morph. Gefasskrypt. 1: 46. 1875.

Distribution:West Indies| Mexico North America| Central America| Colombia South America| Ecuador South America| Peru South America| Bolivia South America| Brazil South America|