Plants evergreen. Rhizome erect or ascending, short, densely covered with linear brown scales. Fronds 30-90 cm; stipe brown, 13-40 cm, ca. 4 mm in diam. at base, sparsely scaly; scales brown to dark brown, linear. Lamina bipinnate, oblong to deltoid-ovate, 24-70 × 10-35 cm at middle, often 20 cm, lower part slightly contracted, base fertile, apex acuminate or slightly acute, sterile; rachis without proliferous bulbils, abaxially scaly; scales dark brown to blackish brown, linear, twisted. Pinnae 12-26 pairs, alternate, slightly ascendant, lanceolate, lower part not contracted, asymmetrical at base, shortly stalked, middle pinnae 12-17 × 2.6-3.5 cm, 1-pinnate, caudate or acuminate; costa adaxially sulcate, abaxially scaly; scales dark brown to blackish brown, linear, twisted. Pinnules 12-35 pairs, alternate, shortly stalked, oblong, 0.9-2.2 × 0.5-0.8 cm, bases cuneate, acroscopic bases with rounded auricles, margins deeply toothed or lobed, apices acute, apices of most lobes obviously spinulose; basal acroscopic pinnules largest, pinnatilobate; abaxially with few shortly filiform microscales, adaxially subglabrous; frond texture papery; venation pinnate, lateral veins 5-8 pairs, dichotomous, distinct. Sori (3-)5-8 pairs per pinnule, in 1 row on each side of midrib, terminal on veinlets; indusia present, irregularly lacerate. 2n = 82.
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