Japan Flora: Delicate, very thinly hairy, especially while young; rhizomes capillary, branched, forming a loose mat; fronds small; stipes 7-20 mm. long, glabrous, narrowly winged in upper part; blades deltoid- ovate to narrowly so, 1.5-3 cm. long, 1-1.5 cm. wide, bipinnati- parted, the rachis winged; pinnae rather few, ascending, di­vided or simple in the upper ones; ultimate segments more or less elongate, 1.2-1.7 mm. wide, entire, retuse or sometimes rounded at apex; indusia orbicular to broadly ovate, the valves 1.2-1.5 mm. wide, entire or obsoletely bilobed on upper margin. Damp woods in mountains.

Hokkaido, Honshu, Shikoku, Kyushu. Sakhalin and Korea.