Rhizome creeping, 1-1.5 cm in diam., densely scaly; scales dark brownish, ovate-lanceolate, 2-3 mm. Fronds close together; sterile fronds bipinnate, 70-90 cm; stipe 10-35 cm, base covered with scales, ca. 3 mm in diam., grooved adaxially; lamina dark green when dry, ovate-lanceolate, 50-65 × 15-20 cm, papery, glabrous, terminal segment prolonged to flagelliform, bulbil subterminal and large; rachis with a narrow wing on upper part; pinnae ca. 20 pairs, alternate, 1-1.5 cm apart, lanceolate, 20-22 × ca. 3 cm, base broadly cuneate, margin lobed to 1/2 toward costa, apex long caudate, basal pairs with short stalk 3-4 mm; lobes 22-26 pairs, ca. 1 mm apart, elliptic, 8-12 × ca. 5 mm, margin usually entire or slightly undulate, apex rounded, with a long spine in each sinus; veinlets 5 or 6 pairs, simple pinnate, sometimes veins forming a costal areole. Fertile fronds: stipe ca. 35 cm; lamina ca. 20 cm; pinnae lanceolate, 4-6 × 0.6-0.9 cm, with short stalk, apex obtuse. Sporangia inserted throughout abaxial surface.
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