Rhizome 2-5 mm in diam., with dense red-brown hairs to 3 mm. Stipe usually red-brown, sometimes chestnut-brown, distally paler, 12-70 cm, 1.5-5 mm in diam., grooved adaxially, stipe with dense, red-brown, glandular hairs to 0.5 mm and occasional eglandular hairs to 2 mm, ± rough; rachis red-brown or chestnut-brown at base, chestnut-brown to yellow-brown distally, hairs similar to those of stipe; lamina 3-or 4-pinnate, ovate in outline, 20-80(-130) × 10-90 cm, abaxially with stout, often rather rigid, red-brown, brownish tinged, or ± colorless, glandular hairs to 0.5 mm, plus occasional longer, chestnut-brown, eglandular hairs on midribs and veins, adaxially with hairs similar but shorter and sparser; pinnae 20-30 pairs, opposite or subopposite, largest at or near base, ovate to narrowly triangular, 10-52 × 3-28 cm; pinnules narrowly ovate to ovate, 2-14 × 0.8-5 cm; ultimate pinnules to 10 × 5 mm. Sori circular or ovate, without hairs between sporangia, protected by broad, reflexed, green marginal flaps.
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