Japan Flora: Rhizomes slender, creeping, re­motely leaved; stipes straw-colored, 40-50 cm. long, sparsely scaly, usually longer than the blades; scales membranous, 6-10 mm. long, 1-4 mm. wide, pale brown, entire; blades deltoid, 20-30 cm. long, slightly wider than long, abruptly acuminate, glabrous, 3-pinnate, the rachis glabrous but puberulent on up­per side at insertion of the pinnae; pinnae 5-6 pairs, acumi­nate, the lowest ones largest, narrowly ovate, 7-12 cm. wide, short-petiolulate, with a pair of much-reduced pinnules above the base, the upper pinnae rather abruptly reduced; pinnules oblong-ovate, 7-10 mm. long, 3-5 mm. wide, obtuse, sessile, pinnatiparted, with few, rather prominent, spine-tipped teeth on upper margin; sori rounded, about 1 mm. across, sub- costular; indusia thinly membranous, minute, whitish, sparsely fimbriate. Coniferous woods in mountains.

Honshu (centr. distr.); rare. Sakhalin, Korea, Manchuria, China to e. Si­beria, and the Himalayas.