Japan Flora: izomes short, erect to short-creeping; fronds often more than 1 m. long, deciduous, prominently scaly; stipes tufted, 10-30 cm. long, light green; scales thinly membranous, brown, lanceo- late，linear, or narrowly ovate, 3-8 mm. long, entire; blades oblanceolate, 50-80 cm. long, 12-25 cm. wide, abruptly acumi- nate, gradually narrowed toward the base, bipinnatiparted, the rachis sparsely short-pilose on upper side; scales linear to lin­ear-lanceolate, 2-5 mm. long; pinnae rather numerous, spread­ing, broadly linear to linear-lanceolate, 1-2 (-2.5) cm. wide, acuminate, nearly truncate at base, sessile, sparsely scaly be­neath glabrous above except on the costas, the lowermost pin­nae ovate-deltoid, obtuse, 1-2 cm. long; pinnules spreading, ob­long to elliptic, 3-5 mm. wide, obtuse to rounded, the lowest slightly longer than the others, the veinlets simple or forked; sori submarginal; indusia usually reniform-orbicular, some­times quadrate to deltoid, 0.2-0.5 mm. across, frequently ob­lique, erose. Mountains.

Hokkaido, Honshu, Shikoku, Kyushu.  Korea (Dagelet Isl.), Kuriles, and Kamchatka.

var. yakumontana (Masam.) Tagawa. Fronds smaller, 6-25 cm. long; pinnules ovate to ovate-oblong. Kyushu (Yakushima).