Japan Flora: Stipes stout, light brown, tufted, about 60 cm. long, dilated near base, to 15 mm. wide above the base, very sparsely scaly in the upper part, rather densely so toward the base; scales pale brown, membranous, broadly lanceolate to ovate, 15-2.5 cm. long, 4-8 mm. wide, entire; blades herbaceous, narrowly oblong, often more than 1 m. long, 35-45 cm. wide, short-acuminate, slightly narrowed at base, bipinnatiparted; pinnae 15-20 pairs, subopposite to alternate, spreading, linear- lanceolate, about 20 cm. long, 3.5-4 cm. wide, acuminate, scarcely narrowed at base, sessile, sparingly pubescent while young along costas, the rachis prominently winged; pinnules numerous, horizontally spreading, narrowly oblong, 4-8 mm. wide, obtuse, pinnately lobed; sori 12-20, subcostular; indusia lanceolate, 1-2 mm. long, slightly arcuate, sometimes some­what athyrioid, minutely ciliolate.  Wet meadows in moun­tains.

Hokkaido, Honshu (centr. and n. distr.). Sakhalin, s. Kuriles, and Kamchatka.