Roots proliferous. Stems erect, unbranched; scales black with pale margins, linear, extremely narrow, 2--3 mm, only several cells wide. Leaves monomorphic. Petiole green in small leaves, black abaxially and green adaxially in large leaves, (1--)2--7(--16) cm, 1--2 times length of blade; indument of fine, nonglandular hairs on veins. Blade deltate, simple to 2-pinnate, 1---8(--12) × 1--6(--8) cm, thin, papery with scattered hairs on both surfaces; base truncate; margins crenate-dentate; apex pointed, not rooting. Rachis green, dull, glabrous. Pinnae in 0--5 pairs, ovate to deltate, simple to lobed to pinnate proximally, 1--6 × 1--3.5 cm, proximal pinna pair largest; base broadly cuneate to truncate; margins irregularly crenate; apex rounded to pointed. Veins free, evident. Sori 1--15(--35) per pinna, on both basiscopic and acroscopic sides. Spores 64 per sporangium. 2 n = 72.
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