Japan Flora: Rhizomes slender, long-creeping, 1.5-2 mm. across, sparsely scaly, amote; stipes 10-20 cm. long, slender, straw-colored, smooth, lustrous, with few scales toward the dark brown base, very sparsely so above; scales ovate, acute; blades deltoid to deltoid-ovate, 10-15 cm. long, 7-12 cm. wide, acuminate, glabrous or some­times with scattered hairlike scales on the rachises; pinnae thinly membranous, ovate-lanceolate, 5-10 cm. long, 2-3 cm. wide, acuminate, short-petiolulate; pinnules obliquely ovate, 5-10 mm. long, 3-6 mm. wide, obtuse, obliquely cuneate at base, very short-petiolulate, pinnately parted, obtusely toothed; veinlets ending in the sinus between the teeth; sori roundj indusia orbicular to elliptic, thinly membranous, white. Coniferous woods in high mountains.

Honshu (Shinano and Suruga Prov.); rare. n. Korea to Siberia and n. Europe.