Rhizome dorsiventrally flattened, 1-3 mm wide, short-creeping, internodes up to 25 mm long, not white waxy, roots densely set; vascular strands 8-12, with sclerified sheaths, sclerenchyma strands absent. Rhizome scales peltate, sparsely set, appressed or slightly spreading, narrowly ovate or triangular, (2-)3.5-6 by 0.5-1 mm, margin denticulate, apex acute, clathrate or subclathrate, central region glabrous. Fronds not or slightly dimorphic, sessile to stipitate, thin-herbaceous. Stipe absent or up to 0.5 cm long, 1-2.5 mm thick; lamina simple, linear, 60-75 by 2-3 cm, index 20-40, base cuneate-angustate to narrowly angustate, gradually decurrent into two ridges at the base of the stipe; margin entire, apex acuminate, the lower surface without acicular hairs. Venation: veins prominent and distinct, 6-10 mm apart, zigzag, dichotomously branched near the margin; connecting veins 3 or 4, ana-or catadromous, forming equally sized, sometimes irregularly shaped, areoles, sometimes also a row of small primary costal areoles; included veins more or less immersed and indistinct, variously anastomosing, free veinlets simple. Sori separate, round, superficial or slightly immersed, 1 mm diam., mostly irregularly scattered on the smallest veinlets, 2 per veinlet, 15-30 per sq.cm, absent from the basal parts for 0.3-0.7 of the total length of the lamina, present in marginal and costal areoles; paraphyses simple uniseriate hairs with glandular topcells, 2-or 3-celled.
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