Rhizome sometimes forming a short erect trunk. Fronds dimorphic, 12-50 (-165) cm long, 4-25 (-80) cm wide. Stipe 4-82 cm long, stramineous to reddish brown, glabrous except for narrow triangular acuminate entire dark reddish brown scales at base. Lamina ovate, pinnate, with 5-20 pairs of pinnae; rachis and costae stramineous to reddish brown, glabrous; sterile pinnae narrowly lanceolate, tapering to both ends, 2.5-36 cm long, 10-25 mm wide, stalked at base of lamina, becoming sessile towards apex; stalk articulated at rachis; margins entire, crenate to serrate at apices; basal pinnae similar or slightly shorter; fertile pinnae linear, 6-27 cm long, 1.5-6 mm wide. Spores 47 × 34 µm; perine scaberulous; exine smooth.
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