Rhizome short-creeping, 2 mm ø; scales rather dark brown, narrowly triangular, to 1.25 mm long, to 8-seriate at base, with a short uniseriate apex. Leaves crowded; petioles c. 10-40 cm long, 1/2-2 times as long as the lamina, stramineous or reddish brown or darker with age, at least in the upper part obtusely to sharply bi-angular, often also sulcate. Lamina bipinnate (rarely simply pinnate and fertile, or subtripinnate), 12-35 cm long, with 1-5 pinnae to a side and a conform but often longer terminal one; primary rachis abaxially bi-angular, sulcate. Pinnae strongly ascending, 2.5 cm distant, linear, 10-25 by 0.7-2 cm, long-acuminate; secondary rachises abaxially bi-angular to shallowly sulcate. Pinnules c. 30-40 to a side, herbaceous, mostly dark green when dry, close, subcontiguous to overlapping, ascending or the lower ones spreading, 7-10 by 3.5-5 mm (rarely smaller, 5 by 2.5 mm), 1.5-2.5 times as long as wide, subovate to dimidiate-subligulate, very obtuse, little narrowed to the rounded apex; upper/outer margin with 1-3 incisions, these in large pinnules 1/2-1/3 mm deep, in small ones sometimes deeper; margin otherwise entire; sterile margin shallowly crenate. Upper pinnules ± entire, gradually and very strongly reduced, several denticuliform ones confluent with the small, narrow pinna-apex. Veins immersed, not evident, mostly twice forked, forming a (sometimes incomplete) series of areoles 1/2-2/3 mm wide. Sori interrupted by the incisions, mostly tri-or quadrinerval, longer in upper, entire pinnules. Indusium pale, subentire, 0.3 mm wide, not reaching the margin by 0.2 mm, little reflexed at maturity. Spores pale yellowish, trilete, smooth, c. 25 μ.
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