Rhizome creeping, up to 4 mm wide with dark brown to black multicellular hairs ± 1.5 mm long. Fronds climbing, (1–)6–12(–20) m long, up to 48 cm wide; rachis mat, pale brown to grey-green, twining, up to 3 mm wide; secondary rachises produced at intervals of 7–20 cm, up to 1 cm long with an aborted apical bud densely clothed with brown multicellular hairs 1.5 mm long. Pinnae triangular, 2-pinnate to 3-pinnatifid. Sterile pinnules of secondary and tertiary rachises lanceolate-oblong to lanceolate, up to 11 cm long, simple to 2-pinnatifid, narrowly winged, the ultimate segments acute, usually with prominent basal lobes, crenate, the crenations crenulate, hairy at least on the main venation. Fertile pinnules lanceolate, up to 9 cm long, simple to 2-pinnate, usually with a long apical segment and shorter basal segments, the venation hairy on both surfaces, the margins crenate and with irregularly produced linear fertile lobes (2–)4–6(–12) mm long, 1.2 mm wide, each bearing 8–20(–44) sporangia in 2 rows. Fig. 4/1–2