Plants evergreen. Rhizome erect or ascending, short, densely covered with linear brown scales. Fronds 60-120 cm; stipe stramineous, 16-57 cm, 5-7 mm in diam. at base, sparsely covered with linear grayish brown scales and appressed scales; appressed scales blackish brown, lanceolate, subentire. Lamina bipinnate, deltoid-lanceolate, 54-92 × 19-40 cm, not contracted toward base, basal part sterile, apex acute, fertile; rachis without proliferous bulbils, covered with linear and lanceolate scales and larger scales; large scales sparse, bicolorous, middle part castaneous brown, ovate, up to 7 × 4 mm, subentire, caudate. Pinnae 18-26 pairs, alternate, ascendant, shortly stalked, lanceolate, not contracted toward base, bases asymmetrical, apices caudate, basal pinnae 11-17 × 1.8-3.5 cm near base, 1-pinnate; costa scaly; scales linear or lanceolate and brown, or ovate and castaneous brown. Pinnules 18-23 pairs, alternate, shortly stalked, narrowly deltoid-ovate, 1.6-2.6 × 0.6-0.8 cm, bases cuneate, auricles deltoid, margins lobed, long spinulose, apices acute with acute tips; basal acroscopic pinnules largest, pinnatipartite; abaxially with lanceolate microscales, adaxially subglabrous; frond texture papery; venation pinnate on pinnules, lateral veins 6-9 pairs, dichotomous, distinct. Sori 6-8 pairs per pinnule, in 1 row on each side of midrib or more on acroscopic side, terminal on veinlets, brown; exindusiate, or indusia not well developed, caducous.
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