Japan Flora: Rhizomes stout; woolly hairs red-brown, mixed with some blackish ones in the fertile areas, soon deciduous except at base of pinnae; sterile fronds tufted, erect, green; stipe shorter than the blade, flattened and dilated near base; blades oblong-lanceolate, 30-60 cm. long, 12-20 cm. wide, abruptly contracted and short-acuminate at apex, not or very shortly narrowed at base; pinnae many, horizontally spreading, linear- lanceolate, 16-23 mm. wide, acuminate, pinnatiparted, sessile on the posterior side, truncate and subsessile on the anterior side; segmen校 rather numerous, oblong-ovate, 4-7 mm. wide, sub-entire, obtuse to rounded at the tip, 1-nerved, the veinlets slender, usually once forked, pinnately arranged; fertile blades several, central, erect, strict, narrow, the pinnae ascending, red-brown, soon withering after spore dissemination. May-July. Wet places.

Hokkaido, Honshu, Shikoku, Kyushu; lo­cally abundant. s. Kuriles, Sakhalin, Amur, Ussuri, Man­churia, Korea, China, and Formosa.