Plants 0.5-2(-3) m tall. Rhizomes creeping, 2-3 mm in diam., covered with dense dark brown or brown hairs. Stipe stramineous, 0.3-1(-2) m, 2-6 mm wide, glabrous; rachis 1-3(-5) times dichotomously branched, basal internode 10-15 cm, covered with dark brown hairs, glabrescent, second internode 3-5 cm; apical buds ca. 2 mm, covered with dense brown hairs; bracts ovate to ovate-oblong, 5-10 mm, margin irregularly crenate, rarely entire; rachises with a pair of lateral stipulelike pinnae at each dichotomy; lower lateral pinnules broadly lanceolate, 10-25 × 4-7 cm, upper ones smaller, 4-10 × 2-4 cm; ultimate pinnae lanceolate or broadly lanceolate, 15-25(-35) × 4-8(-10) cm, base attenuate, apex caudate; lobes 15-50 on each side, linear-lanceolate or lanceolate, 10-50 × 2-4 mm, margin entire, apex emarginate or obtuse; lamina papery, glaucous abaxially, yellowish green or green adaxially, with sparse brown hairs on costae and veins abaxially; costae prominent on both surfaces; veins 3-5 in each group. Sori in 1 line on each side of costule; sporangia 5-8.
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