Japan Flora: Rhi­zomes slender, long-creeping, wiry, 2-3 mm. across, the scales membranous, spreading, more or less lustrous, lanceolate, 2.5-4 mm. long, acuminate, sparsely denticulate, clathrate; fronds remote; stipes 2-6 cm. long; blades thinly chartaceous, broadly linear to deltoid-lanceolate, 10-15(-20) cm. long, 1.5-5 cm. wide, acuminate, usually with an obtuse angle on both sides at base, abruptly decurrent on the short stipe, subentire to undulate, often sinuately lobulate on lower margin, nearly glabrous on both sides; costa raised on both sides, the veins and veinlets not distinct; sori round, or sometimes oblong, about 2 mm. across, with peltate paraphyses while very young.        

Honshu (Kazusa and Izu Prov. and westw.), Shikoku, Kyushu. China