Japan Flora: Rhizomes long-creeping, 2-3 mm. across; stipes 20-30 cm. long, prominently scaly especially to ward the base; scales uniformly black-brown, lustrous, broadly lanceolate, 7-10 mm. long, 1-3 mm. wide, sparsely spinulose toward the tip; blades herbaceous, glabrous, deltoid, 15-30 cm. long and as wide or slightly wider than long, acuminate, bipinnatiparted, the rachis sparsely scaly; pinnae 4 to 5 pairs, the lowest ones largest, opposite, spreading, 10-20 cm. long, 5-10 cm. wide, distinctly petiolulate, slightly broader on the posterior side than on the anterior, acuminate, the uppermost pinnae smaller; pinnules equilateral, ovate to broadly lanceo­late, 15-35(-5) cm. long, 7-15 mm. wide, acute to obtuse, sessile or very short-petiolulate, regularly pinnatiparted, the ultimate pinnules oblong, 5-8 mm. long, 4-5 mm. wide, cre- nately toothed, decurrent to the costule; indusia broadly linear to lanceolate, 1-3 mm. long, solitary, rarely forked above or diplazioid, erose-dentate. Woods in mountains; Hokkaido, Honshu (centr. and n. distr.). Korea. China, Manchuria.