Rhizome short-creeping, 1.5-2 mm ø; scales castaneous, narrowly triangular, to 3 mm long, up to 8-seriate at the base, with a short uniseriate apex. Leaves clustered; petioles black, dull, abaxially rounded, adaxially with a flat groove, often bearing some scattered dark narrow scales, 2-15 cm long, mostly considerably shorter than the lamina. Lamina linear, c. 6-25 cm long, 8-18 mm wide, with up to c. 50 pinnules to a side; rachis dark, not pale-margined, abaxially terete at base, upwards (starting at the lower to upper 1/3) with a keel that becomes progressively more acute above. Pinnules thickly coriaceous, sometimes wrinkled when dry, dark, half their width apart to (above) overlapping, spreading or slightly decurved, suborbicular to very shortly and asymmetrically ovate, the smaller ones 4 by 4 to 5 by 6 mm, the larger ones 8 by 7 mm; base unequal, basiscopically narrower, acroscopically broadly rounded to subangular; margin entire, also in sterile pinnules, thinner in texture and paler, not rarely somewhat revolute. Lower pinnules slightly or not remote and reduced, upper pinnules gradually and more strongly reduced but not confluent, the terminal pinnule free or nearly so, suborbicular or asymmetrically rhombic, occasionally lobed. Veins and sori as in the preceding species. Spores rather dark brown, trilete, smooth, c. 31-34 μ.
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