Japan Flora: Rhizomes creeping, densely scaly, 1-1.5 mm. across, the scales deep brown, mem­branous, lanceolate or ovate-lanceolate, 3-5 mm. long, 1-1.5 mm. wide, acuminate, clathrate with large oblong thin cells, rounded and peltate at base, with few slender teeth; stipes 1-4 cm. long, straw-colored, glabrous; blades lanceolate or linear- lanceolate, 5-15 cm. long, 6-15 mm, wide, gradually narrowed at both ends, entire or slightly undulate, pale green, glabrous, thinly dispersed with small scales while young, the costa dis­tinct, raised below; sori slightly nearer the costa than the margin.

Honshu (Shinano Prov.); rare. Formosa, China, and n. India to Siberia.