Plants 25-60 cm tall. Rhizome long creeping, 2.5-4 mm in diam., apex scaly; scales narrowly triangular to triangular, entire or sparsely fimbriate at base. Fronds up to ca. 5 mm apart, dark green when dry, membranous-herbaceous, subglabrous; stipe grayish black to dark purplish, shiny, 10-20 cm, base with scales similar to those on rhizome; lamina 1-pinnate, narrowly oblong-triangular, 15-35 × 3-5(-7) cm, truncate at base, acuminate-caudate at apex; rachis shiny, dark purplish; pinnae 25-40 pairs, almost sessile, rectangular to trapeziform or lunate, 1.8-2.5(-3.6) × 0.5-0.9 cm, dimidiate, apex obtuse, base asymmetrical, acroscopic side truncate to cuneate and parallel to rachis, basiscopic side cut away and narrowly cuneate and entire, acroscopic margin deeply crenate to dentate with lobes (ca. 1 mm wide) cut up to 1/4-2/5 of way to costa, lower pinnae spreading or deflexed, upper pinnae ascending. Veins distinct, forking and free, 1 vein per marginal lobe and ending below sharp tooth, basiscopic side with 6 or 7 veins lacking. Sori linear, 1-3 mm, at tip of subtending veins and located in marginal teeth; indusia persistent, yellowish brown to deep brown, semi-elliptic, membranous, entire. Plants sexual diploids (2n = 78), agamosporous triploids with "n" = 2n = 117, or tetraploids (2n = 156).
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