Rhizome rather short-to rather long-creeping, c. 2 mm ø; scales reddish brown, narrowly triangular, to 2.5 mm long, to c. 6-seriate at base, with a long uniseriate apex. Leaves close to c. 1 cm apart; petioles slender, 2/3-1 mm ø at apex, reddish brown to atropurpureous, at least upward pale-margined, abaxially sharply bi-angular, the base usually subterete, c. 10-35 cm long. Lamina oblong, c. 12-30 cm long, c. 2-3 times as long as wide, to 1.5 times as long as the petiole, rarely shorter, pinnate + pinnatifid, less often at the base pinnate + pinnatilobate; rachis abaxially at the base dark and pale-angled, the two abaxial angles of the petiole merging into one near the basal pinnae to form a sharp keel on the rachis, the upper part quite pale. Larger pinnae c. 10-15 to a side, somewhat ascending, about their width apart, lanceolate to linear, the largest c. 8-15 cm long, (0.5-)l.25-3 cm wide, subsessile, acuminate; lowest pinnae the longest, the upper ones gradually and strongly reduced, confluent into a pinnatifid leaf-apex. Texture chartaceous or subcoriaceous or sometimes coriaceous, colour medium green or brownish when dry. Lower pinnae pinnatilobate to the middle (rarely less) to deeply pinnatifid to a narrow costal wing, the lobes asymmetrically triangular and serrate or crenate if short, linear, obtuse, subentire to crenate if larger, ascending, occasionally somewhat falcate, often 12-15 major ones to a side in the larger pinnae, to 2.5 by 3 mm; basal basiscopic segments of most pinnae reduced, those opposite them often somewhat prolongate. Costae of pinnae pale, abaxially acute, of segments pale, flat, both abaxially prominulous. Upper segments strongly reduced, most pinnae with a long pinnatilobate-crenate apex. Veins hidden, ascending, simple or rarely once forked. Sori uninerval, on the lateral and not rarely also on the terminal veinlets of the segments, separated by crenations; indusium pouch-shaped, +-semi-elliptic, with straight or slightly lobed edge, 1/3-1/2 mm long and broad, mostly falling short of the apex of its lobule by its width or more, the margin sometimes revolute and touching it when dry. Spores pale brownish, subellipsoidal to bean-shaped, smooth, 34-36 by 24-28 μ.
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