Rhizomes stout, ascending or shortly creeping, densely clothed with brownish, membranous, broadly ovate or ovate-lanceolate large scales at apex and stipe bases. Fronds caespitose; fertile fronds (30-)40-70(-87) cm; stipe chestnut-black at base, upward gradually stramineous, occasionally reddish chestnut, 8-20(-31) cm, upward with sparse, brown, membranous, lanceolate scales; lamina pinnate, broadly lanceolate to oblong-lanceolate, (24-)30-40(-59) × (5-)8-12(-18) cm, apex acuminate; pinnae pinnatipartite, 18-25 pairs, only few lower pairs gradually shortened; basal pinnae usually more than 2.5 cm, rarely shorter; middle pinnae narrowly lanceolate, (2.5-)4-5(-9) × 0.7-2.5 cm, base subtruncate, apex acuminate; lower pinnae subopposite, upward pinnae alternate, spreading, 1-3 cm apart, pinnatipartite near to costae; pinna lobes (7-)12-15(-19) pairs, contiguous, oblong, 4-10 × 2-3 mm, margin entire or ± crenate, apex rounded or obtuse and crenate. Veins visible on both surfaces, pinnate, ca. 5 pairs, simple or forked. Lamina herbaceous when dried, green, with sparse multicellular short hairs along rachis, costae, midribs, and veins. Sori narrowly lunate to linear, 3-5 pairs per lobe, almost from midrib to lamina margin, 1-1.5 mm, often dense at maturity; indusia similar to sori, pale brown, persistent. Spores bilateral, perispore surface with few low folds. 2n = 80, 160.
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