J. Bot. (Hooker) 4: 58. 1841.
Plants epiphytic. Stems creeping, branched, not whitish pruinose, 8–30 mm diam.; scales concolored, lanceolate, not clathrate, glabrous, margins dentate. Leaves monomorphic, widely spaced, not conspicuously narrowed at tip, to 130 cm. Petiole articulate to stem, dark-brown, round in cross-section, with 2 adaxial grooves. Blade ovate to elliptic, not pectinate, pinnatisect with broadly winged rachises and rounded sinuses, with fewer than 20 pairs of segments, glaucous, usually glabrous, scales absent; rachis glabrous. Segments linear to lanceolate, margins entire, apex rounded. Veins free near margins, well developed near costae, highly reticulate, usually with 1 row of costal areoles extending from vein to vein without included veinlets, and with a series of elongate, polygonal areoles with 1–3 excurrent included veinlets meeting at apices, and similar areoles closer to margin of segment mostly without included veinlets. Sori on veins, transverse, 2 in each major areole on included veinlets, circular to oblong; indument absent. Spores tuberculate. x = 37.
Tropical regions, North America, Mexico, West Indies, Central America, South America
Species 2–4 (1 in the flora).