Japan Flora: Rhizomes short-creeping, rather stout; fronds about 60 cm. long, glabrous; stipes 30-40 cm. long, about 3 mm. across, terete, with two deep grooves in upper part, very sparsely scaly in upper part, those at base broadly linear, 4-5 mm. long, acuminate, spinulose, black­brown; blades ovate, pinnate, the rachis 10-15 cm. long; pinnae 5-7, alternate, except for the lowest pair, firmly herbaceous, broadly lanceolate to narrowly oblong, 15-18 cm. long, 3-4.5 cm. wide, acuminate, acute, slightly unequal at base, nearly entire except for a few teeth near tip, slightly re­curved on margin, the petiolules of the lateral pinnae 2-10 mm. long, the terminal one 15-30 mm. long; costa prominent especially beneath; sori usually double (diplazioid), linear; indusia unequal, usually about 20 mm. long, erose and cilio­late.                   

Kyushu (Yakushima and Tanegashima); rare. Ryukyus, China, and Tonkin.