Japan Flora: Rhizomes creeping, very slender, about 1.5 mm. across, sparsely leafy and scaly; scales broadly lanceolate, 1-2 mm. long, fuga­cious, pale brown; fronds delicate, glabrous; stipes 3-10 cm. long, 0.5-0.7 mm. across, light brown, slightly lustrous, smooth, sparsely scaly at base; blades membranous, oblong- ovate or ovate, 3-7 cm. long, 2-3 cm. wide, 1- or 2-pinnate; pinnae simple or ternate, very short-petiolulate to subsessile; sterile pinnules ovate to obovate or flabellate, 4-7 mm. long, rounded to crenate-toothed on upper half, broadly cuneate and entire on lower portion; fertile lobes broadly lanceolate, 5-12 mm. long, 3-4 mm. wide, crenate to subentire. July-Sept Wet shaded rocks, alpine regions.

Honshu (centr. distr.); very rare. Siberia, the Himalayas, and N. America.