Plants 3-8(-13) cm tall. Rhizome erect, short, apex scaly; scales dark brown to black, triangular-ovate, margin shortly fimbriate glandular. Fronds caespitose; stipe green, slender, threadlike, 0.3-2.5(-9) cm, subglabrous, adaxially sulcate; lamina triangular to narrowly triangular, (0.6-)1.5-6 × 0.5-2.5 cm, apex obtuse to subacute, 2-pinnate to almost 3-pinnate; pinnae (3-) 5-7 pairs, alternate or basal ones subopposite, stalk slender, threadlike, often at least one stalk with tiny gemma in acroscopic axil, basal pinnae not reduced, broadly ovate to triangular, 4(-12) × 4(-6) mm, pinnate to 2-pinnatifid, upper pinnae trifid to bifid; pinnules 2 or 3(or 4) pairs or 1 pair and a trifid apex, usually bifid, trifid, or simple, basal acroscopic pinnule largest, cordiform or elliptic, 2-3 × 1-2 mm, base cuneate, decurrent on costa, margin entire, apex variable, obtuse or mucronate to acute; pinnae near apex simple or bifid. Veins obscure, anadromously pinnate, simple, 1 per segment or pinnule, with hydathode at end, not reaching margin. Frond herbaceous, green; rachis green, subglabrous, adaxially shallowly sulcate, apex not flagelliform, lamina subglabrous, average guard cell length 45-49 µm. Sori 1 per segment or pinnule, basal to median on subtending vein, subelliptic, 1-2 mm; indusia grayish green, elliptic, membranous, entire, opening toward costa or costule, persistent. Sporangia with 32 spores, perispore lophate (alate), average exospore length 38-42 µm. Plants sexual, diploid: 2n = 72.
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