Rhizome shortly creeping, 8-15 mm in diam., covered with lanceolate, clathrate, subentire, brown or blackish scales. Fronds ± close together, 60-120 cm; sterile fronds pinnate, 20-110 × 15-28 cm; stipe 8-45 cm, densely scaly near base, bearing small scales at apex, with 5-9 vascular bundles; lamina dark green or brownish, 12-65 cm, widest below middle, herbaceous, terminal segment narrowly triangular, longer to shorter than central pinnae, base trifid; rachis not winged; pinnae 6-15 pairs, opposite below middle, base broadly cuneate to subcordate, margin usually lobed to 1/3 toward costa, crenate-serrate, with a prominent tooth in each sinus, apex acuminate; secondary veins slightly prominent; veins forming a costal areole and distal areoles, part of areoles with usually 1 simple, excurrent free vein. Fertile fronds 30-125 cm; stipe 15-70 cm; pinnae 6-25 pairs, 2-6 cm apart, 4-8 × ca. 1 cm, lowermost 2 pinnae 1-7 mm stalked. Sporangia inserted throughout abaxial surface, arrangement acrostichoid. 2n = 82.
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