Rhizomes erect, short, 2-2.5 cm in diam., densely scaly at apex and at base of stipes; rhizome scales reddish brown, narrowly lanceolate, 1-2 cm, thinly membranous, entire at margins, fibriform and curly at apex. Stipe dark brown at base, stramineous toward apex, 30-55 cm, 3.5-5 mm in diam. at base, grooved above, densely clothed with scales; scales appressed, reddish brown, lanceolate to ovate-lanceolate, 2-3 cm. Lamina bipinnatifid to tripinnatifid at base, triangular-lanceolate, 30-60 × 20-45 cm; pinnae (3-)7 or 8 pairs; basal pinnae largest, subopposite, triangular, 14-25 × 9-16 cm; pinnules 1-3 pairs; basal basiscopic pinnules or lobes of basal pinnae longest, 8-15 × 2.3-3.5 cm, bases asymmetrically rounded-cuneate, margins crenate-lobed, apices long acuminate; bases of upper pinnae or lobes decurrent, with veinlets arising from rachis; texture thickly papery to leathery, dark brown when dried, glabrous on both surfaces; rachises and main veins deeply stramineous and densely clothed with brown, long-articulate hairs and with sparse squamules. Veins free, pinnate, 6-10 pairs per lobe, inconspicuous, simple or 2-4-forked, basiscopic veinlets anastomosing, forming a single row of narrow areoles along costae. Sori orbicular, medial along veinlets, in 2 irregular rows between main veins; exindusiate. Perispore coarsely folded.
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