Caudex up to 15 m. or more tall, and 30 cm. diam., except towards base much thickened by dense mass of rootlets, black, marked by hexagonal scars of fallen stipites. Stipes stout, black, to 1 m. long, up to ± 8 cm. diam. near base; tuberculate; copiously clad towards base by black linear paleae c. 3 mm. long. Rhachis (and secondary rhachides and costae) stout, pale brown, muricate, clad in brownish hairs, later glabrate. Lamina up to c. 6 × 2 m., 2-3-pinnate, coriac., dark green above, pale green below. Primary pinnae up to 1 m. long, oblong-lanceolate, attenuate; secondary up to 15 cm. long, narrow-oblong attenuate. Pinnules c. 1 cm. long, lower distinct, upper confluent, narrow-oblong obtuse to acute, subfalcate, crenate-serrate to crenulately lobed; margins recurved, veins several times forked. Sori up to c. 16 per pinnule, 1 mm. or more diam., us. cop. Indusium thin, at first covering sorus, splitting irregularly.