Rhizome short-to somewhat more long-creeping, 2-3 mm ø; scales castaneous, elongate-triangular, to c. 2 mm long, to c. 6-seriate at base, long-acuminate. Leaves close to 1 cm apart; petioles very dark purplish brown, dull or shining, 1-2 mm ø at apex, abaxially terete, 10-35 cm long, mostly shorter than the lamina. Lamina elongate-triangular to oblong or sub-pentagonal, 10-35 cm long, pinnate + deeply pinnatifid, or at the base bipinnate (+ pinnatifid), subcoriaceous or coriaceous, olivaceous-brown when dry. Primary rachis atropurpureous or dark castaneous, abaxially terete. Pinnae ascending, c. 12-20 major ones to a side, lanceolate, the lower ones usually triangular, subsessile, often somewhat overlapping, acuminate, the larger ones deeply pinnatifid or occasionally pinnate at the base and then sometimes the largest basiscopic pinnules pinnatifid, to c. 15 by 2.5 cm; major pinnules (segments) to 18 to a side, lanceolate, ascending, 30 by 2.5 cm to 8 by 7 mm, or larger if incised, otherwise serrate or crenate, unequally cuneate at the base, obtuse or subacute, rapidly decreasing in size to the pinna-apex; secondary (and, if any, tertiary) rachises abruptly pale (except sometimes those of the lowest pinnae), abaxially terete. Upper pinnae crenate, confluent into a pinnatifid leaf-apex. Veins immersed, hidden, or slightly elevated, simple, or forked in the larger lobes. Sori uninerval, slightly immersed, single in the lobes of the ultimate segments, the margin opposite the indusium sometimes notched; indusium dark, 0.3-0.6 mm long, 0.3 mm wide, mostly longer than wide, not reaching the margin by its width or more. Spores brownish, ellipsoidal, smooth, c. 35 by 26 μ.
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