Fronds to 5 m or more long, arching. Stipe to 2 m long, up to two-thirds of leaf length, ± smooth. Lamina 2-pinnate, deltoid, to 3.2 m long and 2.5 m wide. Pinnae ± linear-lanceolate, alternate, c. 9 pairs, to 150 cm long and 45 cm wide. Pinnules 29–40 pairs, opposite to subopposite, sometimes becoming alternate towards pinna apex, to 30 cm long and 2 cm wide, ± parallel-sided; base unequal to cuneate; margins scarcely serrulate; apex long-acuminate and more strongly toothed. Sori submarginal, with 10–15 sporangia.
Fronds 2-5 m; stipes smooth. Laminae bipinnate; pinnae 65-70 cm, with 15-30 pairs of spreading pinnules; pinnules 7-20 × 0.9-3.5 cm, bases cordate, rounded to cuneate, margins crenulate to serrate, apices acuminate to caudate. Veins obvious, false veins obvious, extending nearly to costule. Sori marginal to ca. 1 mm from margin, ca. 2 mm, with 8-10 sporangia.