Japan Flora: Rhizomes short-creeping, stout; fronds large; stipes straw- colored, 30-80 cm. long, the basal scales brown, membranous, broadly linear to linear-lanceolate, 3-4 cm. long, 3-5 mm. wide, long-acuminate, entire; blades narrowly ovate to broadly ovate-lanceolate, 30-100 cm. long, 20-35 cm. wide, acuminate, bipinnitiparted, sometimes with numerous adventitious plant- lets on the upper side; pinnae obliquely spreading, ovate- lanceolate to deltoid-lanceolate, 12-30 cm. long, 4-10 cm. wide, acuminate, somewhat cuneate at base, sessile or short-petiolu- late, pinnately parted, slightly wider on the anterior than on the posterior side; pinnules lanceolate, 7-10 cm. long, acute to acuminate, minutely toothed; sori along the costule of the pin­nules 1 inear-oblanceolate to narrowly oblong, 2-4 mm. long.            

Honshu, (Etchu, Rikuzen Prov. and sonthw.), Shikoku, Kyushu. China

var. formosana Rosenst. Fronds larger, to about 2 m. long, 50 cm. wide or more; pinnae larger, more deeply pinnatiparted; pinnules broadly linear to linear- lanceolate, to 15 cm. long, about 1 cm. wide, often candately long-acuminate, minutely toothed. Honshu (Izu Isis, and Awa Prov.), Shikoku, Kyushu. Ryukyus and Formosa