Rhizome 3-5 mm in diam., sparsely scaly; scales dark brown, ovate-lanceolate, peltate, clathrate, margin toothed, apex long acuminate. Stipe straw-colored or light chestnut, usually 20-30 cm, glabrous. Lamina usually pinnatifid, 35-45 × 30-35 cm, rarely simple or pinnately 3-lobed, rachis with wings ± as wide as lobes; lateral lobes usually 3-5 pairs, lanceolate, 12-20 × 2-3 cm, leathery, both surfaces glabrous, margin entire, apex acuminate; midrib raised on both surfaces, veins indistinct, areoles with many included veinlets ending in raised point. Sori orbicular, in 1 row or 2 irregular rows on each side of midrib, abaxially deeply hollowed and adaxially distinctly raised. Spore surface minutely echinate.
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