Plants 3-8 cm tall. Rhizome erect, short, scaly; scales dark brown to black, narrowly triangular, margins fimbriate. Fronds caespitose; stipe green, thin, threadlike, 0.5-1.5(-2.5) cm, subglabrous, adaxially shallowly sulcate; lamina narrowly triangular to linear, 2-6 × 0.7-1.2 cm, base slightly or not reduced, bipinnate, apex acute or truncate, usually flagelliform with terminal small bud; pinnae 6-13 pairs, alternate or subopposite, shortly stalked and only occasionally with a gemma in upper axil, ovate, 4-6 × 3-4 mm, pinnate; pinnules 1 or 2 pairs, usually simple, elliptic, 2-3 × 1-2 mm, base cuneate, margin entire, apex acute; pinnae near apex less divided. Veins simple, 1 per pinnule or segment, not reaching margin. Fronds thinly herbaceous, green to grayish green when dry; rachis green, subglabrous, adaxially sulcate. Sori 1 per segment or pinnule, subelliptic, 0.5-1 mm; indusia grayish green, subelliptic, membranous, entire, opening toward costa, persistent. Sporangia with 32 spores, perispore lophate (alate), average exospore length 44-48 µm.
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