Rhizome short-creeping. Fronds dimorphic, 20-70 cm long, 12-27 cm wide. Stipe 17-34 cm long, brown, glabrous except for linear-lanceolate acuminate reddish brown scales at base. Lamina deltoid, pinnate, with 2-5 pairs of pinnae; rachis and costae brown to greenish brown, ±glabrous except for a few scattered scales and short hairs in pinna axils; sterile pinnae oblong-lanceolate, long-acuminate, unequal and subcordate at rachis, 7-17 cm long, 1.5-3.5 cm wide, shortly stalked at base of lamina, becoming adnate towards apex; margins crenate; veins anastomosing; basal pinnae longest; bulbils sometimes present in axils of uppermost pinnae; fertile pinnae to c. 3 mm wide. Spores 40 × 24 µm wide, tuberculate and minutely vermiculate.
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