Japan Flora: Rhizomes short, ascending, stout, covered with bases of old withered leaves, the woolly hairs cinnamon-brown, mixed with blackish ones, soon decidu- ous; fronds dimorphic, sterile fronds to 1 m. long, tufted; stipes stramineous, smooth, with a chartaceous wing on each side near base; blades ovate or triangular-ovate, bipinnate, glabrous or nearly so; pinnae 20-30 cm. long, oblong-ovate, the lower ones short-petiolulate; pinnules oblong to broadly lanceolate, 4니 0 cm. long, 1-2.5 cm. wide, obtuse to acute, obliquely trun­cate and rounded at base, minutely toothed, green above, glaucescent beneath, sessile, the costa distinct, penninerved, the veinlets spreading, parallel, 1-3 times forked; fertile fronds 20-50 cm. long, rising among the sterile fronds, the sporophylls paniculate, erect, rather loose, cinnamon-brown.  Apr.-May (Oct.).

Hokkaido, Honshu, Shikoku, Kyushu; common. s. Sakhalin, Korea, Ryukyus, Formosa, China to the Him­alayas.