Japan Flora: Rhizomes slender, creeping, with remote stipes, with narrowly ovate, membranous scales about 3 mm. long; stipes rather slender, 15-35 cm. long, pale brown to straw- cofored, naked except for a few scales toward the base; fertile blades usually deltoid in outline, 10-17 cm. long, 8-15 cm. wide, short-acuminate, pinnate, without a distinct terminal pinna, naked on both sides, the rachis broadly winged; pinnae 5-7 pairs, opposite, obliquely spreading, lanceolate, 7-15 mm. wide, broadly adnate at base, acuminate to very acute, minutely toothed, with a rounded to very obtuse lobe 5-7 mm. wide at the base, the lowest pinnae 5-10 cm. long, 2-5 cm. wide, pinnately parted on the posterior side or sometimes on both sides, the pinnules narrowly lanceolate, to 5 cm. long, 4-8 mm. wide; sterile blades similar to the fertile, the stipes usually shorter, the pinnae wider and less prominently parted; sori rusty-brown, linear, straight, unequal, 2-15 mm. long, along the costas and rachis, those along the costules of the pinnules 1-6 mm. long.                

Kyushu (Yakushima). Ryukyus, Formosa, and s. China. The typical variety occurs in the Ryukyus, Formosa, s. China to Indochina