Rhizome dorsiventrally slightly flattened, 2-4 mm wide, short-creeping, internodes up to 15 mm long, not white waxy, roots sparsely set; vascular strands 7 or 8, with conspicuous sclerified sheaths, sclerenchyma strands absent. Rhizome scales pseudopeltate, sparsely to densely set, appressed, narrowly ovate or triangular, (1-)2-5 by 0.5-1 mm, margin denticulate, clathrate or subclathrate, central region glabrous. Fronds not or slightly dimorphic, stipitate, herbaceous to subcoriaceous. Stipe 1.5-8 cm long, up to 2 mm thick; lamina pinnatifid (towards the apex sometimes dichotomously branched), obovate to narrowly obovate, 20-50 by 5-30 cm, index 1.5-4, widest above the middle, base narrowly angustate, decurrent to a long wing, lobes 2-4 at each side, longest lobes at position 1 or 2 from base, widest at base, 5.5-25 by 0.5-1.5 cm, index 6-20(-60), connected by a wing 0.2-1 cm wide; margin entire, apex acuminate, lower surface without acicular hairs. Venation: veins more or less immersed and indistinct, 4-13 mm apart, more or less straight, dichotomously branched below the middle to near the margin; one connecting vein forming a row of large areoles bordered by several smaller areoles, the costal areole, if present, formed by smaller veins; included venation variously anastomosing, more or less immersed and indistinct, free veinlets simple to twice forked. Sori separate, round or elongate along the veinlets, superficial or slightly immersed, 0.5-1 by 1.5 mm, mostly irregularly scattered on the smallest veinlets, 20-45 per sq.cm, on the whole surface of the lamina, present in marginal and costal areoles; paraphyses simple uniseriate hairs with glandular topcells, 2-or 3-celled.
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