Rhizome glaucous, 5-10 mm. diam., appearing thicker by dense investiture of spreading broadly ovate, attenuate, pale brown paleae up to 1 cm. long, tips long persistent; stipites rather distant, articulated to rhizome, leaving distinct scars on falling. Stipes 5-30 cm. long, pale brown, glab., rather slender; clad in broad-ovate attenuate paleae at base. Lamina deeply pinnatifid, acuminate; 10-120 cm. × 5-35 cm.; thin, dark green; veins rather obscure, except main and secondaries; areoles rather large, with included free veinlets. Lobes up to 20 pairs, subopp., up to 20 cm. × 15 mm., oblong-attenuate to lanceolate; margins very slightly sinuate, hardly thickened at sinus. Sori in two rows, on each side of main and secondary veins, mostly on upper and terminal lobes, few to 35 per lobe, rather distant, round, 4-5 mm. diam., appearing as dark spots on the upper surface, or as bullate protuberances.

n = 37 bivalents