Plants more than 1.3 m tall. Rhizome not seen. Stipe straw-colored, ca. 80 cm, ca. 5 mm in diam. at middle, glabrous, grooved adaxially; rachis similar, slightly lustrous, glabrous, grooved adaxially; lamina 2-or 3-pinnatipartite, ovate-oblong in outline, ca. 65 × 30-50 cm; lateral pinnae ca. 7 pairs, opposite or subopposite, slightly decumbent, stalked (5-10 mm), distal ones sessile, slightly asymmetrically broadly lanceolate, ca. 35 × 8 cm, base broadly cuneate, pectinately divided to narrowly winged costae, apex caudate-acuminate; basal pair of pinnae often with a basiscopic pinnule near base similar to main part of pinna but smaller; segments 30-35 pairs, alternate, 1.5-3 mm apart, decumbent, lanceolate, somewhat falcate, median ones 35-55 × 7-9 mm, basally wider, margins entire, apex obtuse; basal segments conspicuously shorter; terminal pinna similar to middle lateral pinnae, but symmetrical and with basal stalk ca. 1 cm; costae and midvein prominent abaxially, straw-colored, glabrous, costae adaxially shallowly grooved, with flat rigid spine on both sides, midvein with a few very short spines on upper surface; veins conspicuous on both sides, decumbent, 2-forked at base, lateral veins of segment base abaxially arising from rachis, and other lateral vein adaxially extended at margin of incision; lamina grass-green, thickly papery when dried, glabrous. Indusia gray-brown, linear, membranous, entire, persistent.
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