Plants 40-60 cm tall. Rhizome long creeping, 3-5 mm in diam., apex scaly; scales blackish brown, narrowly triangular to triangular. Fronds remote, up to 8 mm apart, grayish to dark green when dry, herbaceous, subglabrous; stipe shiny and dark purple to black, 15-32 cm, sparsely scaly to subglabrous; lamina 1-pinnate, narrowly triangular to triangular, 20-40 × 10-18 cm, base truncate and widest, apex acuminate to caudate; rachis shiny, purplish black, subglabrous; pinnae 18-25 pairs, shortly stalked and blackish brown rachis color extending via stipicel onto costa abaxially, trapeziform-oblong to falcate, middle pinnae 5-8(-10) × 1.3-1.8(-2) cm, dimidiate, apex acute, base asymmetrical, acroscopic side truncate and often almost parallel to rachis, basiscopic side of basal pinnae excavate, in middle pinnae narrowly cuneate and entire, acroscopic margin serrate, teeth not retuse; pinnae spreading to ascending. Veins distinct, forking and free, ending below a marginal tooth, basiscopic side with (3 or)4-6 veins lacking. Sori medial, linear, 4-6 mm; indusia persistent, pale brown, semi-elliptic to linear, membranous, entire, opening toward costa.
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Lithophytic or epiphytic ferns with semi-erect fronds. Rhizome short-creeping, scaly. Stipe and rachis dark red-brown, sparsely scaly, glossy; stipe 8–25 cm long, 0.5–2 mm diam. Lamina narrowly triangular to ovate or triangular, pinnate with a long-acuminate apex, 15–35 cm long, 5–20 cm wide, pale green, thin, ±glabrous. Pinnae in 10–25 pairs, ±oblong, slightly falcate, inserted at ± right angles to rachis; basal basiscopic portion excised so that each pinna appears to be joined to a short stalk in the lower corner and has (3–) 4–6 acroscopic veins diverge from main vein before first basiscopic vein diverges from main vein; line of excision at c. 40–50° to midrib; margins serrate; apices acute to acuminate; longest pinnae at or near base, 2.5–9 cm long, 8–15 mm wide, gradually decreasing upwards but often abruptly contracted to a ±linear, pinnatifid, apical segment; lower ones usually deflexed. Sori to 5 mm long, slightly curved. Spores dark with fimbriate or serrate wings and tuberculate or ribbed lacunae; exospores 34.2–34.7 × 23.5–24.9 µm (means).
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