Plants terrestrial, 40-70 cm tall. Rhizome suberect or ascending, short, 1-1.5 cm in diam., densely scaly at apex; scales dark brown with narrow paler margins, glossy, lanceolate, 7-8 mm, membranous, entire, apices fibriform. Fronds clustered, dimorphic or subdimorphic, fertile fronds taller and narrower; stipe deep stramineous, 20-30 cm, ca. 3 mm in diam. at base, grooved above, sparsely covered with articulate light brown hairs, lower part clothed with dark brown scales similar to those of rhizome, becoming shorter and narrower upward. Lamina base tripinnatifid, bipinnatipartite upward, dark green when dried, elliptic-ovate, 25-40 × 15-20 cm, herbaceous, glabrous or pubescent, margins ciliate, apex acuminate; rachises stramineous, with sparse linear dark brown scales, rachises and costae densely clothed with articulate brown hairs or glabrescent abaxially; pinnae 3-10 pairs, subopposite toward base, apical ones alternate, oblique, interval 2-5 cm; basal pair of pinnae largest, obliquely triangular, 8-15 × 6-10 cm, acuminate, stalks ca. 1 cm, pinnatipartite to 3/4 way toward costa, bearing a pair of separate large pinnules; middle pinnae lanceolate, 6-10 × 3-4 cm, bases cuneate, apices acuminate, pinnatipartite to 3/4 way toward costa, occasionally with subseparate pinnules; basal basiscopic pinnules lanceolate, 6-8 × 1.5-2 cm, bases cuneate, apices acuminate, pinnatipartite to 1/2 to costa; lobes 8-12 pairs, interval 1-2 mm, falcate-oblong, 7-8 × 5-6 mm, mucronate. Veins pinnate, 8 or 9 pairs, forked, free or forming angular areoles, conspicuous on both sides. Sori orbicular, 5-7 pairs terminal on veinlets; indusia brown, orbicular-reniform, membranous, entire, persistent.
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Caudex short, erect; fronds dimorphous, the fertile ones with contracted pinnae; stipes commonly 30 cm long, light castaneous, bearing many narrow black scales; lamina to 30 cm long; pinnae 3 or 4 pairs, basal pinnae to 14 cm long, basal basiscopic pinnules to 6 cm long; middle pinnae of sterile frond lobed about 3/5 towards their costae, the lobes subentire and sinuses between them narrow; middle pinnae of fertile fronds very deeply lobed, the lobes crenate and well-spaced; veins usually forked in lobes of sterile pinnae, the basal ones irregularly anastomosing (rarely in Malesian specimens), often simple in lobes of fertile pinnae; thick hairs present between veins on upper surface, most abundant on sterile pinnae, slender ones less abundant on lower surface; sori on acroscopic branches of veins; indusia variably hairy.
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