Description from Flora of China
Stipe 60-65 cm, ca. 2 mm in diam. at base, base dark brown, glabrous, upper part coarse, with short, brown hairs, shallowly grooved adaxially; rachis similar, with sparse, short, brown hairs; lamina brown-green when dry, 3-pinnate, oblong-triangular in outline, 75-80 × 25-30 cm, papery, both surfaces with sparse bristles along veins, apex acuminate; pinnae 18-20 pairs, 10-12 cm apart, subopposite, basal pairs lanceolate, 20-25 × 5-6 cm, with ca. 1 cm stalk, apex acuminate, upper pairs lanceolate, 12-15 × 3-4 cm; pinnules 22-26 pairs, alternate, 1-2 cm apart, lanceolate, 3-4 × 1-1.2 cm, shortly stalked, pinnatipartite almost to costae, apex acuminate; ultimate lobes 8-10 pairs, oblong, ca. 5 × 1.5-1.8 mm, connate at base, separated by sinus, entire or toothed, apex obtuse and acute; midvein prominent abaxially, secondary veins pinnate to marginal. Sori 1-3 pairs, circular, at base of sinus, protected by semicircular, brownish green marginal flap.
● Dense forests. Yunnan.