Rhizome dorsiventrally flattened, 4-9 mm thick, short-creeping, internodes 2-9 mm long, not white waxy, roots densely set, forming a thick mat; vascular strands 16-21,with sclerified sheaths, sclerenchyma strands absent. Rhizome scales pseudopeltate, sparsely set, slightly spreading, ovate or triangular, 1-5 by 0.3-2 mm, margin dentate, apex acute, clathrate or subclathrate, central region bearing multiseptate hairs at least when young. Fronds not or slightly dimorphic, stipitate or sessile, herbaceous. Stipe absent or up to 2 cm long, 3.5-7 mm thick; lamina simple, narrowly elliptic or obovate to linear, 65-85 by 4-7.5 cm, index 11-16, base truncate to cuneate, gradually decurrent into two ridges at base of the stipe; margin entire, apex acute to acuminate, lower surface without acicular hairs. Venation: veins prominent and distinct, 9-18 mm apart, ± straight or zigzag, dichotomously branched near the margin; connecting veins 4-7, catadromous, forming small primary costal areoles and several more or less equally sized, sometimes irregularly shaped, areoles; included veins more or less immersed and indistinct or prominent and distinct, variously anastomosing, free veinlets simple or once forked. Sori separate, round, 1-1.5 mm diam., superficial or slightly immersed, mostly irregularly scattered on the smallest veinlets, occasionally partly on tertiary veins, 1 or 2 per veinlet, present or absent in marginal and costal areoles, 5-15(-20) per sq.cm, absent from the basal part for 0.5-0.7 of total length of the lamina; paraphyses 3-8-celled, uniseriate with glandular topcells.
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