Rhizome dorsiventrally flattened, 1-4 mm wide, short-to long-creeping, internodes up to 3 cm long, not white waxy, roots sparsely set; vascular strands 7-9, with conspicuous sclerified sheaths, sclerenchyma strands absent. Rhizome scales peltate or occasionally some pseudopeltate, densely set, appressed, round, elliptic, ovate, narrowly ovate or triangular, 0.5-3 by 0.3-1.5 mm, the margin entire to dentate, often eroded, apex rounded or acute, clathrate or subclathrate, central region glabrous. Fronds not or slightly dimorphic, simple or pinnatifid, stipitate, thin-herbaceous. Simple fronds: stipe 0.5-15 cm long, 0.5-1.5 mm thick; lamina narrowly elliptic, ovate to linear, 15-40 by 1.5-5.5 cm, index 4-15, base obtuse to narrowly angustate, decurrent to a long wing, margin entire, apex acute or acuminate to caudate, lower surface without acicular hairs. Dissected fronds: stipe 5-20 cm long, up to 1.5 mm thick; lamina round to ovate, 20-40 by 15-35 cm, index 1-1.5; widest below the middle, lobes 1-4 at each side, longest lobes at position 1-2 from base, 7.5-20 by 1.3-2.5 cm, index 3.5-12, widest at base to below the middle, connected by a 0.5-1.5 cm wide wing; apical lobe longer than upper lateral lobes, widest at base or just above base. Venation: veins prominent and distinct, 5-15 mm apart, more or less straight, dichotomously branched below to about the middle; a single connecting veins forming one row of large areoles, bordered by several smaller areoles; costal areole, if present, formed by smaller veins, included venation more or less immersed and indistinct, variously anastomosing, free veinlets simple to twice forked. Sori separate, round or elongate along veinlets, superficial or slightly immersed, 1-2.5 by 2-3(-35) mm, ir-regularly scattered on the smaller anastomosing veins, 1-20 per sq.cm, on the whole surface of the lamina, present in marginal and costal areoles, sometimes concentrated on a marginal vein; paraphyses simple uniseriate hairs with glandular topcells, 2-4 (-5)-celled.
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