Rhizome short-creeping, c. 1.25 mm ø; scales very narrowly triangular to acicular, to 3 mm long, to 7-seriate at base but often the apical half uniseriate, the basal half biseriate almost to base. Leaves close; petioles stramineous, abaxially below obtusely, upward acutely bi-angular and sulcate, c. 12-30 cm long, 1-1.5 times as long as the lamina. Lamina 15-22 cm long, simply pinnate or with one pair of pinnae to 15 cm long and a conform terminal one; rachises like the upper part of the petiole. Pinnules c. 20-30 to a side, dark olivaceous when dry, herbaceous, spreading, the upper ones subcontiguous, the lower ones their width apart; larger pinnules asymmetrically elongate-triangular to subligulate, 18 by 6 to 30 by 9 mm, 3-3.5 times as long as wide, not much narrowed to the narrowed-rounded apex, a distinct outer margin not developed; both margins almost straight at base and convex outward. Upper pinnules gradually and strongly reduced, 1 or 2 of a few mm long connected with the narrowly lanceolate acuminate terminal segment. Margins entire, or the upper remotely and shallowly crenate; sterile margin not seen. Veins immersed, ± evident, regularly anastomosing, with 1 or not rarely 2 rows of areoles of fluetuating width. Sori continuous, or interrupted by the crenations of the upper margin (probably quite continuous in fully fertile pinnules). Indusium entire, greenish, 0.25 mm wide or less, not reaching the margin by its width or more, scarcely reflexed at maturity. Spores light brown, trilete, smooth, c. 23 μ.
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