Rhizome 2-4 mm in diam., dorsiventrally flattened; scales pseudopeltate, narrowly ovate or triangular, 2-4 × 0.7-1.2 mm, clathrate or subclathrate, central region bearing multiseptate hairs at least when young or glabrous, margin denticulate. Fronds not or only slightly dimorphic; stipe winged for a considerable part; lamina simple, narrowly ovate to narrowly obovate, 28-60 × 3-8.5 cm, thinly herbaceous, abaxial surface without acicular hairs, base very narrowly cuneate, margin entire, apex acute or acuminate; lateral veins ± straight, prominent and distinct, (6-)7.6-14 mm apart, dichotomously branched near margin, connecting veins 4-7 between adjacent veins, anadromous, veinlets generally forming 2-4 prominent and distinct areoles, free veinlets simple or once forked. Sori orbicular or elongate, in 1 discontinuous line between each pair of veins, superficial or slightly sunken, absent from basal 30%-50% of lamina, 1-4(-7) per veinlet.
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