Roots not proliferous. Stems erect, unbranched; scales brown, lanceolate, 3--6 × 1--1.5 mm, margins entire. Leaves monomorphic. Petiole brown to straw-colored, dull, 3--10 cm, 1/8--1/4 length of blade; indument of brown, narrowly lanceolate scales. Blade linear, simple, 8--35 × 2--4.5 cm, thick, papery, nearly glabrous; base cordate; margins entire; apex acuminate, not rooting. Rachis brown proximally, straw-colored distally, dull, glabrous. Veins free, obscure. Sori numerous, perpendicular to rachis, or nearly so, usually restricted to distal 1/2 of blade. Spores 64 per sporangium. Usually 2 n = 144.
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