Plants 20-50 cm tall. Rhizome erect, short, scaly; scales dark brown, narrowly triangular, margins dentate-fimbriate. Fronds caespitose; stipe grayish green to black, 10-22 cm, base scaly, more sparsely so upward, adaxially sulcate; lamina triangular-ovate to narrowly triangular, 12-28 × 5-11 cm, pinnate or pinnate-pinnatifid to 2-pinnate at base and gradually becoming pinnate toward apex, apex acute; terminal apical pinna simple or pinnatifid; pinnae 5-12(-14) pairs, simple or pinnate (basal pinnae), opposite or alternate, stalk 5-12 mm; basal pinnae usually largest, 3-6 × 2-3 cm, rhomboid or triangular to narrowly triangular, base asymmetrical, acroscopic side truncate to cuneate, basiscopic side cuneate, margin irregularly crenate-sinuate, apex acute to acuminate; segments 1-3, rhomboid to elliptic or obovate, 0.6-2 × 0.3-1.2 cm, basal acroscopic segment largest. Costa shallowly sulcate adaxially, lateral veins flabellately forking, not reaching margin. Fronds leathery, dark brown when dry; rachis dark brown to grayish black at base, becoming green toward apex, with dark brown, narrowly triangular scales with lateral fimbriae and filiform apex, subglabrous when old, adaxially sulcate. Sori 3-6 per segment (8-12 on basal acroscopic segment), linear, 4-15 mm; indusia brown, linear, thickly membranous, entire, opening toward costa or major veins. Spores with dark brown, lophate perispore, average exospore length 26-29 µm (in tetraploids) or 40-45 µm (in octoploids).
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