Japan Flora: Rhizomes creeping, 3-4 mm. across, scaly, the fronds close to remote; fronds deciduous; stipes 20-40 cm. long, rather slender, lustrous, 2-3 mm. across, rather densely scaly and with minute scurf­like hairs; scales spreading, ovate to broadly lanceolate, 1-3.5 mm. long, acute, rounded at base, with oblong to elliptic cells; blades thinly herbaceous, deltoid-ovate, 30-50 cm. long, 25-40 cm. wide, acuminate, 3-pinnate, the rachises with jointed curved hairs; pinnae usually opposite, obliquely to nearly hori­zontally spreading, broadly lanceolate, 2.5-6 cm. wide, acumi­nate, nearly sessile, the lowest pinnae narrowly deltoid-ovate, 斗-】0 cm. wide; pinnules narrowly oblong-ovate, 1.5-4 cm. long, 7-15 mm. wide, obtuse to acute, sessile, horizontally spreading, pinnatifid to pinnate, sparsely pubescent; ultimate pinnules oblong, obtuse to rounded, obtusely toothed to lobulate; veinlets reaching the margin; sori near the base of the sinus; indusia minute, ovate-orbicular to ovate. Woods in mountains.

Honshu (Iwashiro Prov. and westw.), Shikoku, Kyushu.