Japan Flora: Rhizomes short, erect, covered with the basal stubs of old stipes; sterile fronds tufted; stipes 1 分-20 cm. long, 3-angled, pale green, scaly toward the base, the scales brown, membranous, lanceo­late, 1-1.5 cm. long, entire, often somewhat blackish striolate; blades of sterile fronds thinly herbaceous, broadly oblanceolate, 40-80 cm. long, 15-30 cm. wide, abruptly short-acuminate, gradually narrowed at base, vivid green; pinnae 30-50 pairs, broadly linear, 12-20 mm. wide, long^acuminate, sessile, closely pinnatiparted; segments oblong to narrowly ovate, 2.5-5 mm. wide, obliquely spreading, obtuse to acute, crenulate, the low­est pair sometimes slightly deflexed and stipulelike, the veins simple; fertile fronds 30-60 cm. long, erect, the stipes shorter than the blades, broadly sulcate on the upper side; pinnae nar­rowly linear, 4-6 cm, long, slightly torulose. Mountains.

Hokkaido, Honshu, Shikoku, Kyushu; locally abundant. s. Kuriles, Kamchatka, Sakhalin, Korea, China, Manchuria, Si­beria to Europe.