Rhizome short-creeping, l.5-2 mm ø; scales castaneous, lustrous, narrowly triangular to almost acicular, up to 5-seriate at base, the uniseriate apex relatively short. Leaves close; petioles brown to blackish, often ± persistently fibrillose-scaly, abaxially terete or upward ± distinctly keeled, c. 3-15 cm long, mostly much shorter than the lamina. Lamina linear, c. 10-30 cm long, 8-15 mm wide, with up to c. 35 pinnules to a side; rachis abaxially (in small leaves) entirely or (in larger ones) in the upper part keeled, the keel evanescent downward, adaxially sometimes pale-margined, otherwise dark brown to blackish, lustrous. Pinnules chartaceous or less often coriaceous, not or hardly contiguous, spreading, shortly and asymmetrically ovate, 5 by 4 to 8 by 6 mm, especially if large the base acroscopically distinctly angular and often slightly auriculate; upper pinnules gradually and ± strongly reduced, the terminal pinnule asymmetrically rhombic, free or connected with one upper pinnule; lower pinnules more remote, hardly or not reduced. Veins hidden, once forked or simple, a costa scarcely developed. Sori occupying the whole margin except the inner; indusium rigid, entire, c. 0.6-0.8 mm wide, not reaching the margin by half its width or less, little reflexed at maturity. Spores medium to dark brown, trilete, subglobose, smooth, c. 30-35 μ.
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