Japan Flora: Scandent; rhizomes creeping, 3-4 mm. across, densely covered with soft blackish hairs about 1 mm. long; rachis much elongate, twining, 2-striate, pale brown, lustrous; pinnae alternate, with a pair of pinnate segments and a hairy bud at the tip of a short petiolule, the segments deltoid to ovate, ternately 1- or 2-pinnate, with the rachis puberulent in upper part; sterile pinnae thinly chartaceous, often 3- to 5-lobed to -parted, minutely toothed, the terminal lobe or seg­ments elongate deltoid- to linear-lanceolate, to 60 mm. long, 4-8 mm. wide, acute to obtuse; veins obliquely ascending, once to thrice forked, the veinlets ending in the marginal teeth; sporangia in 2 closely adjacent rows on margin beneath the ultimate segments. Aug.-Jan. Thickets and hedges in low­ lands and low mountains.

Honshu (Kanto Distr., Shinano, Etchu Prov. and westw.), Shikoku, Kyushu; common. Ryukyus, Formosa, Korea and China.