Plants 80-150 cm tall. Rhizome 1-1.5 cm in diam. Stipe basally castaneous-brown, upper part, rachis, and lower parts of costae sorrel-red, shiny, stipe 45-80 cm, 3-5 mm in diam., glabrous; lamina 2-or 3-pinnatipartite, ovate in outline, 35-65 × 30-40 cm; lateral pinnae 4-8 pairs, subopposite, decumbent, basal pair sometimes 2-pinnatipartite, shortly stalked; upper pinnae sessile, pectinately divided, lanceolate in outline, 25-30 × ca. 5 cm, base rounded-cuneate and slightly oblique, apex acute, caudate for 3-5 cm; terminal pinna similar but wider and stalked (3-4 cm), basal pair of pinnae often with a basiscopic pinnule near base, similar in shape to main part of pinna but smaller; segments 25-30 pairs, alternate, 3-4 mm apart, sinuses wide and rounded, slightly decumbent, subfalcate, lanceolate, 2.5-4 × 0.5-0.7 cm, base slightly expanded and decurrent, sterile margins densely serrulate, apex obtuse or mucronate, basal segments of pinnae slightly shorter and more widely spaced, basally decrescent to costules; costae prominent abaxially, adaxially straw-colored, shiny, glabrous, adaxially grooved, with spines along groove and bases of midribs; veins conspicuous, oblique, apical pairs of veins simple, remainder 2-forked, basal basiscopic ones from costae, others arising from midribs.
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