Rhizome moderately long-to rather short-creeping, 2-4 mm ø; scales medium brown, elongate-triangular, to 3 mm long, to c. 12-seriate at base, the uniseriate apex relatively short. Leaves rather close; petioles stout, the base often verruculose from scale bases or persistently scaly, dull, stramineous with darker base or darker throughout, abaxially terete, c. 25-75 cm long, slightly shorter than to twice as long as the lamina. Lamina bipinnate, or bipinnate + pinnatifid, at the base often tripinnate, elongate-triangular or subpentagonal-triangular, less often oblong, c. 20-55 cm long; primary rachis stramineous to pale brown, abaxially rounded or narrowed-rounded, keeled only near the apex. Pinnae 15-35 to a side (not counting the confluent Upper ones), laxly ascending, lanceolate, or the basal ones broader at the base, often acroscopically wider at the base, shortly acuminate; larger pinnate pinnae 12-16 cm long, 3-5 cm wide, with c. 20-30 pinnules to a side, the basal pinnae usually with a strongly protracted basal basiscopic secondary pinna (smaller but similar ones may be present next to and opposite it, and on the second pair of pinnae) similar in shape to a middle primary pinna. Secondary (and, if any, tertiary) rachises stramineous, abaxially rounded in the lower, carinate in the upper part. Ultimate free pinnules c. 20-30 to a side, ascending, closely and regularly spaced but not contiguous, subcoriaceous or coriaceous, mostly olivaceous or brownish when dry, lanceolate, mostly obtuse or subacute and with narrowed, cuneate-decurrent base, the larger ones usually 3-4 cm long and 3-4 mm wide, crenate to pinnatifid to the middle (or beyond in the basal pinnae), with abaxially prominulous, pale costa. Veins simple in the lobes (crenations) or forked in the larger ones, somewhat prominulous. Lobes oblong, or ± triangular if small, obtuse. Upper pinnae rather suddenly reduced, pinatifid, then crenate, gradually simpler, confluent into a pinnatifid leaf-apex; upper pinnules (segments) also reduced and confluent. Sori single in the lobes, or paired or a few together in exceptionally large ones, uninerval, their vein often conspicuously broadened at the end; indusium brownish, pouch-shaped to almost triangular, entire, 0.4-0.7 mm long, 0.3-0.5 mm wide, not reaching the margin by its width or less, about equally remote from both the lateral and the apical edges of its lobe. Spores brownish, ellipsoidal, smooth, c. 35 by 24 μ, exceptionally larger.
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