Plants 15-30 cm tall. Rhizomes long and creeping, flattened when dry, 3-5 mm wide, strong, persistently scaly; scales appressed, brownish, lanceolate, 3-5 × 1.3-2 mm, clathrate, membranous, margins slightly undulate; lumina subsquare, isodiametric. Fronds 1-2 cm apart; stipe straw-colored or brownish, 2-10 cm, 1-2 mm in diam.; lamina deep brown on both surfaces or abaxially greenish and adaxially grayish green when dried, broadly lanceolate, (12-)20-30 × 3.5-6 cm, widest 1/3-1/2 from base, normally membranous, less often herbaceous or thinly papery, scales not easily seen, base attenuate or abruptly attenuate, decurrent, margin flat, straight or slightly undulate, apex acute or long caudate; costa raised on both sides, veinlets obviously visible. Sori midway between costa and margins, orbicular or elliptic, 4-6 mm in diam.; paraphyses brown, orbicular, 0.4-0.8 mm in diam.; lumina large.
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