Plants 10-25 cm tall. Rhizome erect, apex scaly; scales dark brown to black, narrowly triangular to linear-subulate, margin fimbriate to subentire. Fronds caespitose; stipe shiny, purplish black, 6-18(-25) cm, terete, rigid and threadlike, with brown, multicellular uniseriate hairs or subglabrous; lamina deltoid-triangular, 6-15 × 3-7(-9) cm, base truncate, (3 or)4-pinnate, apex acuminate; pinnae (8-)12-16 pairs, subopposite to alternate, overlapping, stalk up to ca. 1.3 mm and dark brown abaxially, basal pinnae largest, triangular to ovate, 2-5 × 0.7-2 cm, base auriculate-truncate, tripinnate, apex obtuse to subacute; pinnules 6-10 pairs, anadromous, basal acroscopic pinnule largest, triangular-ovate, 5-12 × 5-8 mm, stalk up to ca. 1 mm, base asymmetrical, acroscopic side truncate, basiscopic side cuneate, apex obtuse, 2-pinnate; ultimate segments 2-4 pairs, basal acroscopic segment most developed, 2-4 × 2-4 mm, 2-or 3-partite (fertile) or simple (sterile) and linear-subulate, ultimate fertile segments 0.5-1.5 mm wide, ultimate sterile segments 0.2-0.4 mm wide, apex acute. Costa and costules sulcate adaxially, green, veins slightly raised or flat adaxially, anadromous, 1 vein per segment, terminal hydathode not reaching margin. Fronds firmly herbaceous, green, lamina with multicellular uniseriate hairs or subglabrous; rachis shiny purplish black, becoming green in upper half toward apex, sulcate adaxially, with brown, multicellular uniseriate hairs or subglabrous. Sori 1 per fertile, forked and pouch-shaped segment, median on acroscopic veinlet, often spreading and obscuring indusium at maturity, oval, 1-1.5 mm; indusium white or gray, semi-elliptic, membranous, hyaline, entire, opening toward costules and margin, persistent. Spores brown to dark brown, lophate (cristate-alate) perispore. Plants tetraploid: 2n = 144.
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