Rhizome shortly creeping, ca. 1 cm in diam., densely scaly; scales fuscous, ovate, ca. 3 mm, margin erose. Fronds close together; sterile fronds bipinnate, ca. 80 cm; stipe 20-30 cm, ca. 3 mm in diam. at base, grooved adaxially, covered with ovate-lanceolate fuscous scales; lamina dark green when dry, triangular-ovate, 50-60 × 20-30 cm, both surfaces glabrous, apex caudate-acuminate; pinnae 12-16 pairs, alternate, with short stalk 2-4 mm, lanceolate, 13-15 × 3-3.5 cm, base rounded-truncate and slightly asymmetrical, margin lobed to 2/3 to costa, apex caudate-acuminate, bulbil subterminal and small; terminal segment prolonged to flagelliform and pinnatifid, bulbil subterminal and large; lobes 16-18 pairs, 2-3 mm apart, elliptic-lanceolate, falcate, 10-15 × 5-6 mm, with a long spine in each sinus; veinlets 6 or 7 pairs, pinnate, simple or bifurcate. Fertile fronds pinnate; stipe 40-45 cm; lamina narrowly lanceolate, ca. 25 × 6 cm; pinnae ca. 10 pairs, elliptic-lanceolate, 2.5-3 × ca. 0.5 cm, margin entire. Sporangia inserted throughout abaxial surface.
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