Rhizome erect, stout, woody. Fronds simple pinnate, with numerous rather distant pinnae, up to 1 m × 20-30 cm; pinnae 15-20 pairs, subopposite, ascending, ca. 2 cm apart; sterile pinnae linear-lanceolate, up to ca. 20 × 1-17 cm, base narrowly cuneate, shortly stalked, articulate to rachis, margin entire or slightly undulate, apex acuminate; veins free, 1 or 2 times branched; basal pinnae fertile, reduced to midrib with small lobes bearing sporangia, rarely with a few reduced sterile pinnae below fertile ones.
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