Plants 5-25 cm tall. Rhizome erect, scaly; scales dark brown to black, narrowly triangular, margin fimbriate at base. Fronds caespitose; stipe 1-5 cm, abaxially purplish black to reddish brown and semi-shiny, adaxially sulcate, with blackish brown narrowly triangular scales mixed with filiform scales; lamina lanceolate, 3-15 × 0.8-2.5(-4) cm, attenuate to both ends, apex pinnatipartite or shortly flagelliform and rooting, 1-or 2-pinnate, up to 3-pinnatifid in large specimens; pinnae 10-20 pairs, shortly stalked, basal pinnae opposite and often strongly reduced or flabellate, upward becoming alternate; middle pinnae largest, narrowly triangular to ovate-elliptic or oblong, (2-)10-15(-20) × 2-7 mm, base almost symmetrical to asymmetrical, acroscopic side truncate, basiscopic side cuneate, pinnatisect to pinnatifid, apex obtuse and with 1 gemma in apical sinus; segments 2-4 pairs, apex obtuse and dentate-serrate with 2-4 teeth; teeth obtuse, mucronate or acute. Veins not prominent, anadromously forking, not reaching margin. Fronds firmly herbaceous, green, lamina with uniseriate gland-tipped hairs or subglabrous, average guard cell length 43-50 µm; rachis with purplish brown to castaneous color extending from basal part up to 2/3 its length on abaxial side, apical part green or stramineous, with purplish black hairlike scales, adaxially green or stramineous, flat or slightly sulcate, green. Sori usually 2-4 on basal acroscopic segment, on others 1 per segment, often confluent at maturity, basal to submedial on subtending veinlets, close to costa, subelliptic to elongate, ca. 1 mm; indusia grayish green to grayish brown, narrowly elliptic, membranous, repand to entire, opening toward costa or major vein. Spores with lophate (costate-cristate) perispore, average exospore length 31-35 µm. Plants sexual, autotetraploid: 2n = 144.
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Roots not proliferous. Stems erect or ascending, unbranched; scales black throughout, narrowly deltate, 2--3 × 0.2--0.3 mm, margins mostly with widely spaced, shallow teeth. Leaves monomorphic. Petiole dark reddish brown throughout, dull, 1--3 cm, 1/10--1/6 length of blade; indument of black filiform scales. Blade lanceolate, 2-pinnate to 2-pinnate-pinnatifid, 4--10 × 1--3 cm, thin, sparsely pubescent; base tapering; apex acute to acuminate, often bearing minute, scaly, proliferous bud. Rachis basally reddish brown, fading to green in distal 1/2 to 3/4, dull, sparsely pubescent and with a few filiform scales. Pinnae 10--20 pairs, narrow, oblong; medial pinnae 5--12 × 4--7 mm; base acute to obtuse; margins coarsely incised; apex notched, bearing proliferous bud. Veins free, obscure. Sori 1--4 pairs per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2 n = 72.
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