Rhizome ascending or erect, massive, naked. Fronds simple pinnate, up to 100-180 × 30-60 cm, hemidimorphic with 3-5 pairs of fertile pinnae in lower middle portion of lamina; pinnae 15-30 pairs, subopposite or alternate, ca. 3 cm apart; sterile pinnae linear, 15-35 × 1-2 cm, lower ones shortly stalked, articulate to rachis, leathery, glabrous, margin thickened, roughly dentate; lateral veins pinnate, lower veinlets forked; fertile fronds developing several times per year; fertile pinnae ca. 1/2 length of sterile ones, 2-4 mm wide, covered throughout with sporangia and turning brownish after spores are shed. 2n = 44.
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