Rhizome short-creeping, 2 mm ø; scales medium brown, to 2.5 mm long, acicular, the lower part biseriate, the upper half uniseriate. Leaves close; petioles dark castaneous to blackish, little lustrous to dull, abaxially terete, to c. 20 cm long. Lamina linear, to c. 30 cm long, to 5.5 cm wide, widest a little above the base, with up to c. 35 pinnules to a side; rachis dark brown, dull, adaxially scarcely pale-margined, abaxially terete, the upper half ± pronouncedly carinate, the keel pale. Pinnules chartaceous to coriaceous, brown when dry, not contiguous, the basal ones remote, spreading or slightly falcately ascending, asymmetrically lanceolate, actue or rarely subacute, the larger ones 18-30 by 8 mm, 1.5 to almost 4 times as long as wide (disregarding the auricle); base unequal, the basiscopic side narrower, the acroscopic side with a short (to 2 mm) subacute auricle. Margin entire, or notehed in sterile pinnules, somewhat revolute. Basal pinnules slightly or not reduced; upper pinnules more strongly and gradually reduced, one or two small ones connected with the narrow, asymmetrically lanceolate terminal segment. Veins hidden, once or twice forked, oblique; costa almost percurrent. Sori continuous; indusium brown, rigid, entire, 0.5 mm wide, reaching the margin or nearly so, little reflexed at maturity. Spores medium brown, smooth, trilete, c. 21 μ.
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