Japan Flora: Rhizomes short-creeping; stipes 30-40 cm. long, rather stout, straw-colored or pale green to pale brown, sparsely scaly on upper part, more densely so toward base; scales lanceo­late, 5-7 mm. long, 1-15(-2) mm. wide, black-brown, lustrous, subentire; blades membranous, deltoid, 40-60 cm. long and nearly as wide, acuminate, glabrous, 3-pinnate to 3-pinnati- sect; pinnae 5-7 pairs, the lower usually opposite,  spreading, acuminate, petiolulate, the upper ones rather abruptly smaller, the lowest pinnae largest, slightly oblique, narrowly ovate, 20-35 cm. long, 10-15 cm. wide, usually contracted at die base, the others narrower, smaller, equilateral, not or scarcely con­tracted at base; pinnules broadly lanceolate, 3-7 cm. long, 12-25 mm. wide, acuminate, shott-petiolulate; ultimate pinnules broadly lanceolate to narrowly oblong, 6-8 mm. long, 2-3 (-4) mm. wide, obtuse, toothed, sometimes lobulate, often slightly decurrent on the rachis; sori 4-10 on the ultimate pinnules, ascending, linear, in 2 rows nwrer the costule than the margin; indusia 1-2 mm. long, linear, straight, the lower ones fre­quently diplazioid.

Honshu (Kanto Distr. and Wakasa Prov. westw.), Shikoku, Kyushu. Korea (Quelpaert Isl.), China, and Indochina.