Japan Flora: Rhi­zomes slender, creeping, sometimes stolonlike, 1-1.5 mm. across, with brownish mukicellular jointed hairs while young; fronds slightly dimorphic, glabrous, the sterile ones usually smaller than the fertile; stipes 3-20 cm. long, pale green in upper part, purple-brown or dark brown and lustrous toward base, grooved on upper side; blades membranous, broadly lanceolate, 7-25 cm. long, 2-6 cm. wide, acuminate to acute; fertile pinnae deltoid-ovate, acute or obtuse in the sterile pinnae, short-petiolulate; ultimate pinnules usually cuneate at base, broadly lanceolate to ovate in the fertile ones, ovate to broadly ovate in the sterile, obtusely toothed; sori marginal; indusia cup-shaped, membranous, glabrous, entire, about 1 mm. long and as wide. June-Oct.

Hokkaido, Honshu, Shikoku, Kyushu. Korea, Manchuria, Ussuri, and China.