Caudex slender, 15-20 m. tall, widened towards base by mass of rootlets and there up to 2 m. diam. Stipes slender, deeply grooved above (as are rhachides and costae), clad at base with cop. linear brown paleae, upper surface densely clad in yellow-brown woolly hairs mingled with small linear paleae, undersurface sparingly so clad. Fronds 3-4 m. × 70-90 cm., 2-3-pinnate, subcoriac. to almost membr., flaccid, dull green above, paler below, falling to leave a clean scar. Primary pinnae 35-45 × 12-14 cm., oblong-lanceolate, acute; secondary pinnae 60-70 × 15-18 mm., linear-oblong, acute to acuminate, obscurely falcate, deeply pinnatifid. Segs 8-9 × 3 mm., oblong, falcate, obtuse to subacute, entire to finely crenulate, or the fertile segs lobulate. Sori cop., 0·5-0.6 mm. diam.; indusium membr., splitting irregularly, persistent.