Epiphyte; rhizome with many fine rootlets, each densely covered with dark, reddish-brown, threadlike scales. Leaves simple, coriaceous, glabrous; blades oblong, round to truncate or often mucronate at apex, tapered at base, the leafy tissue decurrent almost to base of petiole, 13-85 cm long, 3-5 cm wide, covered with a waxlike film when dry. Sori round, large, in single rows between lateral veins in distal third of blade. Croat 5126. Abundant in the forest on larger branches or in the crotches of trees; also frequently found on tree stumps at the margin of the lake. Probably the most common fern on the island.