Japan Flora: Fronds large, glabrous, tufted; stipes rather stout, 40- 60 cm. long, straw-colored, densely scaly near base; scales mem­branous, pale brown, linear-lanceolate to lanceolate, 10-15 mm. long, 1-2 mm. wide, long-acuminate, entire; blades thinly herbaceous, deltoid-ovate to broadly ovate, 40-70 cm. long, 30-50 cm. wide, acuminate, 3-pinnatiparted; pinnae 9-12 pairs, equilateral, spreading, 15-30 cm. long, 4-7 cm. wide, gradually acuminate, short-pctiolulate; primary pinnules nar­rowly deltoid-ovate to deltoid-lanceolate, 2.5-4 cm. long, 8-12 mm. wide, acute to acuminate, very short.petiolulate to sub- sessile, pinnatiparted nearly to the costas; ultimate pinnules ob­long to ovate, 4-7 mm. long, obtuse to subacute, toothed; sori 5-10 to a pinnule, subcostal; indusia thin, oblong and straight, 0.7-1 mm. long, sometimes athyrioid, erose-ciliate.      

Hok­kaido, Honshu, Shikoku.

var. acutissimum (Kodama) Ohwi. Plant smaller, with narrower blades, and the pinnae often horizontally spreading, usually 10-20 cm. long, and with less deeply parted pinnules. Honshu and Shikoku