Rhizomes shortly to long creeping, densely scaly; scales dark, 2-3 mm, 1-4 cells wide at base. Stipe stramineous to greenish with a darker base, rarely dark red-brown, 2-13 cm, abaxially rounded, adaxially grooved; lamina ovate-lanceolate to linear-lanceolate, 7-40 × 1-4 cm, herbaceous, 1-pinnate; rachis abaxially rounded, adaxially grooved, stramineous or dark at base; pinnae 15-30 pairs, alternate except basal ones, shortly stalked, dimidiate, spreading, less than their width apart, lower ones more remote, larger ones 6-20 mm, 3-8 mm wide, twice as long as wide, rhombic-trapeziform to triangular, unequal and attenuate at base, margins incised acroscopically, incisions (0.1-)1-3 mm deep, apex rounded to acuminate; upper pinnules gradually and strongly reduced; veins immersed, simple to twice forked, 0.5-1 mm apart. Sori interrupted, forming 2-6 per pinnule on 2-6 vein ends; indusia sinuate, 1-4 × 0.5-0.7 mm, reaching margin; annulus with 20-24 hardened cells. Spores monolete, smooth. 2n = ca. 300.
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