Rhizome not very short-creeping, 2-2.5 mm ø; scales fuscous, elongate-triangular, to c. 3 mm long, to c. 10-seriate at base, with well-developed uniseriate apex. Leaves not close; petioles atro-purpureous to blackish, dull, abaxially terete in the lower part, upward obtusely to subacutely bi-angular and somewhat pale-angled, c. 15-20 cm long, half as long as to as long as the lamina. Lamina oblong to elongate-rhombic, bipinnate + deeply pinnatipartite at the base (almost tripinnate), c. 20-35 cm long; primary rachis abaxially obtusely bi-angular at the base, ± distinctly pale-angled and often mottled, upward pale, narrowed-rounded, subcarinate near the apex. Primary pinnae c. 15-25 to a side, ascending, often somewhat overlapping, the basal ones c. 10-15 by 3.5-4 cm, the upper ones gradually, then abruptly more strongly reduced, confluent into an acuminate pinnatifid leaf-apex. Secondary rachises abaxially pale, terete at the base, upward narrowed-rounded to subcarinate. Pinnules to 15-20 to a side, ascending, acute to acuminate, not contiguous, the basal basiscopic ones sometimes subpinnate + pinnatilobate; average pinnules deeply pinnatisect, with c. 10-12 ascending linear lobes to a side, these up to 3 by 2/3 mm, obtuse, connected by narrow, upward broader wings, the upper ones denticuliform, broadly connected and forming a lobed pinnule-apex; upper pinnules of pinnae, and pinnules of upper pinnae, less incised, lobed to entire. Pinnule costules abaxially prominent, pale, obtuse; lobes often with revolute margin, chartaceous, brown when dry, the vein immersed but evident, simple or slightly branched in the largest ones. Sori single in the ultimate lobes, absent from the terminal ones, uninerval, terminal in small lobes, on an acroscopic lateral bulge in larger ones; indusium narrowly pouch-shaped, 0.2-0.4 mm long, 0.3-0.7 mm wide, dark, entire, not reaching the margin by 1/2-1 times its width. Spores brownish, ellipsoidal, smooth, c. 35 by 25 μ (very few seen).
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