Stems short-creeping, 4--10 mm diam. Leaves few to many, erect to arching. Petiole essentially absent to ca. 9 cm. Blade yellowish green, linear to linear-elliptic, 24--140 × 3--12 cm, leathery; base attenuate; margins entire to slightly undulate; apex acute (sometimes forked). Veins obvious, primary veins ± prominent, straight to slightly curved, areoles in 7--16(--18) series between costa and margin, with free included veinlets, a percurrent veinlet often dividing some areoles further. Sori in several rows on each side of costa. 2 n = 148. Epiphytic in hammocks and swamps; sometimes on walls in limestone sinkholes where it is reduced in size; substrate circumneutral to subacid; 0 m; Fla.; Mexico; West Indies; Central America; South America.