Japan Flora: Rhizomes stout, ascending, clothed with the basal remains of old stipes; stipes 20-40 cm. long, pale green to slightly purplish, sulcate on upper side, scaly, about 3 mm. across near base, the scales narrowly lanceolate, 5-7 mm. long, 1-1.2 mm. wide near base, brown, sparsely ciliate; blades broadly lanceolate, 30-50 cm. long, 15-25 cm. wide, simply pinnate, nearly naked, contracted in upper portion, short-acuminate; pinnae 13-20 pairs, herbaceous, obliquely spreading, short-petiolulate, linear-lanceolate, 10-17 cm. long, 1-2 (-2.5) cm. wide, falcate, long-caudate, obliquely cuneate and entire at base, simply to doubly acute- or mucronate­toothed, unlobed or sometimes pinnately parted, glabrous; costas rather slender, raised on upper side, the veins ascend­ing, rather remote, usually once to thrice forked; sori mostly in 2 series on the pinnae, ascending, very slightly curved, linear, nearer the costa than the margin, or nearly median； indusia (3-)6-12(-15) mm. long, 1-1.2 mm. wide. 

Hon­shu (Izu Prov. through Tokaido to Kinki and Chugoku Distr.), Shikoku, Kyushu. Ryukyus, Formosa, and China.

var. shikokianum (Makino) Makino.  Pinnae deltoid-lanceolate to linear-lanceolate, petiolulate, pinnately dissected, with a rather prominently winged rachis; pinnules ovate, cuneate at base; veins pinnately branched. Honshu (Totomi, Kii, and Ise Prov.), Shikoku (Tosa Prov.), Kyushu (Hyuga Prov.). China and Formosa.