Japan Flora: Rhizomes creeping, sparsely leafy, 2.5-4 mm. across, with brown membranous broadly lanceolate scales 2.5-3 mm. long; fronds evergreen, glabrous; stipes slen­der, 10-50 cm. long, 1.5-3 mm. across near base, pale green to straw-colored, smooth, striate on the upper side, purple-brown toward the base; blades triangular-ovate, 15-40 cm. long, 8-20 cm. wide, acuminate, deep green on upper side, paler beneath, 3- or 4-pinnate; pinnae obliquely ascending, gradually smaller in the upper ones, alternate, the lowest ones 1/2-2/3 as long as the blade, triangular-ovate, long-acuminate, prominently petiolulate; pinnules narrowly lanceolate, 5-8 mm. long, 1-1.5 mm. wide, acute, entire, the sterile ones often few-toothed; veins unbranched in the sterile pinnules, pinnately branched in fertile ones; sori marginal; false indusia hyaline, paired, often overlapping while young, entire, 3-8 mm. long. Low mountains.

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu; rather common.  s. Korea, China, Formosa, Malay­sia to India.