Roots proliferous. Stems erect, unbranched; scales blackish throughout, narrowly deltate, 0.4--1.1 × 0.3--0.7 mm, margins entire to denticulate. Leaves monomorphic. Petiole blackish throughout, dull, 2--6(--10) cm, 1/4--2/5 length of blade; indument absent. Blade lanceolate, 1--2-pinnate, (4--)8--12(--15) × 1.5--5 cm, thin, glabrous; base not tapered; apex gradually narrowing. Rachis mostly green except occasionally blackish at base, dull, glabrous. Pinnae in (5--)10--20(--25) pairs, oblong-deltate, 1--3.5 × 0.5--1.8 cm; base excavate on basiscopic side; apex pointed. Pinnules linear to oblong, 4--10 mm; apex mostly notched. Veins free, not conspicuous. Sori mostly 1 per segment, 1--3 mm. Spores mostly abortive, some viable. 2 n = 144.
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