Japan Flora: Rhi­zomes short, erect or ascending, densely covered with the basal stubs of old stipes; stipes 20-50 cm. long, straw-colored, densely scaly near base; basal scales broadly linear, 8-12 mm. long, about 1 mm. wide, entire, brown; blades ovate to deltoid-ovate, 25-50 cm. long, 20-40 cm. wide, acuminate, not or scarcely narrowed at base, bipinnate; pinnae broadly lanceolate, 3-5 cm. wide, long-acuminate, equilateral, short-petiolulate or sometimes subsessile; pinnules sessile or very short-petiolulate, oblique, deltoid-ovate to -lanceolate, 15-30 mm. long, 6-13 mm. wide, acute to acuminate, toothed, cuneate to subtrun­cate at base, pinnately lobed to parted, the ultimate pinnules elliptic to oblong, rounded; sori subcostal, 8-15 to a pinnule, lanceolate to linear; indusia lanceolate, 1-2 mm. long, ascend­ing, subentire, straight or hamate.  Woods in mountains.

Hokkaido, Honshu, Shikoku, Kyushu; rather common and variable. Korea and Formosa.

var. yamadae (Miyabe & Kudo) Miyabe & Tatew. Pinnules pinnately parted; indusia strongly erose-toothed. Hokkaido