Plants 0.6-1 m tall. Rhizome erect, short, stout, 1-1.5 cm in diam., scaly at apex and stipe bases; scales (dark) brown, (linear-lanceolate or) lanceolate, 6-8 mm, thickly membranous, entire, apices long acuminate. Fronds clustered; stipe deep stramineous to brown, 40-70 cm, 4-5 mm in diam., bases densely scaly, often clothed with brown articulate hairs, glabrescent upward, winged in upper half or very narrowly nearly to base. Lamina simple or pinnatisect to odd-pinnate, green to deep green, deltoid-ovate, 30-40 × 20-30 cm, base slightly cordate, herbaceous, both surfaces glabrous; rachises and costae dark stramineous, costa raised and pubescent on abaxial surface, main veins raised abaxially, glabrous adaxially but sparsely covered with light brown articulate hairs abaxially, rachises winged throughout; terminal pinna oblanceolate or oblong, 15-18(-25) × 5-10 cm, larger than lateral ones, base attenuate, narrowed into winged rachis, entire or 3-lobed, apex acuminate to caudate; lateral pinnae 1-3 pairs, subopposite, sessile, ovate-lanceolate, 15-18 × 3-5 cm, oblique, subentire, interval 4-6 cm, bases cuneate-attenuate, apices acuminate to caudate; basal pinnae rather large, often with a gemma, often forming broadly lanceolate basiscopic lobes; gemmae (when present) scaly, 1 or more, axillary on both sides of lamina from base to apex; rachises and costae deep stramineous, pubescent abaxially, glabrescent adaxially. Cross veins distinct, veinlets forming inconspicuous subhexagonal areoles, included veinlets simple or forked. Sori orbicular, terminal on included veinlets or anastomosing veins, in 2 irregular rows beside lateral veins, often contiguous-confluent at maturity; indusia brown, reniform, membranous, glabrous, entire, caducous.
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Caudex erect; stipe 40-60 cm long, narrowly winged in its upper part, basal scales 10 mm or more long, 2 mm wide at the base, firm, marginal cells thin-walled; lamina firm, to 50 cm long, consisting of a trilobed apex which is narrowly decurrent at its base almost to the attachment of the uppermost pinnae, and 2 or 3 pairs of pinnae, all with similarly narrowly decurrent bases; buds present on rachis at the base of some pinnae on mature fronds; middle pinnae 20-25 cm long, entire or nearly so, gradually narrowed towards their bases, apex narrowly acuminate, sterile pinnae often wider than fertile, to 6 cm wide; basal pinnae of small fronds narrowed towards their base on both sides, unlobed but the lamina on the basiscopic side wider than on the acroscopic side, of larger fronds with a narrowly winged stalk and a rather long basal basiscopic lobe; pinna-midribs and main veins reddish on the lower surface when dried and minutely hairy, upper surface glabrous; smaller veins concolorous and distinctly prominent both sides; sori small, round, in about 4 irregular rows between the main veins, not on free veinlets in areoles; indusia small, thin glabrous, persistent.
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