Rhizome short-creeping, 1.5-2 mm ø; scales reddish brown, narrowly triangular or linear, to slightly over 1 mm long, to 6-seriate at base but often narrower, with a short uniseriate apex. Leaves close; petioles stramineous or darker with age, abaxially flat or convex and laterally bi-angular, with obtuse, downward gradually evanes-cing ridges, c. 10-30 cm long, about as long as the lamina. Lamina broadly ovate, c. 10-25 cm long, bipinnate (rarely simply pinnate and fertile, or subtripinnate), with 1-4 pinnae to a side and a conform terminal one; primary rachis abaxially slightly concave or upward channelled, bi-angular. Pinnae sessile, ascending, not close, 10-22 cm long, 1.75-2.5 cm wide, gradually narrowed from the lower third or the middle but more strongly so near the apex; upper pinnae slightly or not shortened. Secondary rachises abaxially bi-angular, between the angles flat or convex. Pinnules c. 20-45 to a side, herbaceous, olivaceous or brownish when dry, spreading or a little ascending or slightly decurved, often subcontiguous, evenly spaced, 10-12 by 3-4 mm, ligular or trapeziform, truncate-rounded or narrowed-rounded at apex; upper margin very faintly sinuate or more often with 3 or 4 oblique incisions, the inner very shallow, the outer a little deeper but not reaching to % of the width; outer margin mostly not incised; sterile pinnules crenate-sinuate on the upper and outer margin. Upper pinnules strongly reduced, some denticuliform ones confluent with the caudate pinna-apex. Veins immersed, not evident, mostly twice forked, 1/2-2/ apart, very oblique, free or less often connivent or more freely anastomosing. Sori rarely continuous, mostly interrupted by the incisions, the sorus on the outer margin mostly continuous with the outermost one of the upper margin. Sori of completely fertile pinnules straight or the outer ones slightly convex, mostly on 2-6 veins. Indusium entire, 1/6-1/5 mm wide, not reaching the margin by less than its width, reflexed and ± concealed at maturity. Spores pale brown, trilete, smooth, c. 17-19 μ.
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