Plants 50-80 cm tall. Rhizome erect, short, stout; scales of rhizome and lower part of stipe dense, brownish black, lanceolate, serrulate. Fronds caespitose; stipe stramineous, 18-35 cm, sparsely scaly from middle part of stipe to rachis; scales brownish black, subulate-lanceolate, crenulate; lamina oblong or deltoid-ovate, 25-45 × 15-25 cm, once pinnate, base not or slightly gradually narrowed, apex acuminate; pinnae 10-16 pairs, lanceolate or oblong-lanceolate, 10-12 × 1.5-3 cm, base rounded-truncate, shortly stalked or subsessile, margin spreading sinuate-crenate, apex acuminate. Lamina herbaceous, glabrous adaxially, with 1 or 2 fibrillose scales on costa and veinlets abaxially, with brownish black or brown, linear, crenulate scales along abaxial side of rachis; veins slightly visible, lateral veins pinnate-forked, 3-7 in pinnate groups. Sori below middle of veinlets, in 2 or 3(or 4) irregular rows on both sides of costa, exindusiate.
Rhizome short, erect; scales dense, linear-subtriangular with cordate base and long-tailed apex, up to 15 by 2 mm, dark brown to nearly black, entire. Stipe stramineous, densely scaly at base, more sparsely upwards, up to 30 cm long. Lamina pinnate, oblong-lanceolate, widest at base or just above it, about 45 cm long; rachis grooved above, scaly throughout with narrow, nearly black scales about 5 by 0.2 mm; lateral pinnae usually about 10 pairs, lower pinnae lanceolate, about 12 by 2.7 cm, acuminate at apex, broadly cuneate at sessile base, lobed to ⅕ way towards costa, upper ones becoming smaller, fused to each other to form indistinct apical portion of frond; costa distinct on lower surface, grooved above, glabrous or minutely scaly beneath; lobes subdeltoid, rounded at apex, with a few teeth at margin, up to 4 by 6 mm; chartaceous, green, glabrous; veins pinnate, veinlets simple. Sori in a few indistinct rows near costa, leaving marginal ⅓ of pinna sterile, naked.