L., Sp. Pl.1083.1753
Large epiphyte; rhizome stout, moderately long, with many fine rootlets each densely covered with dark reddishbrown, threadlike scales. Leaves simple, large, glabrate; blades oblong-lanceolate, acuminate, tapered to base and narrowly decurrent nearly to base of petiole, 45-100 cm long, 8-12 cm wide, the midrib prominently raised on both surfaces. Sori round, small, in rows along both sides of each lateral vein. Croat 16532.
Common in the forest, especially in the crotches of tree trunks close to the ground, but also occurring on smaller limbs and more or less flat surfaces. Less frequent on dead trees at the margin of the lake in full sunlight.
Mexico to Peru, Bolivia, Paraguay, and Brazil; West Indies. In Panama, known from tropical moist forest on the Pacific slope in the Canal Zone, Veraguas, Panama, and Darien, from premontane wet forest in Panama, and from tropical wet forest in Chiriqui and Coclé.
See Fig. 34 and fig. on p. 23.