Japan Flora: Rhizomes long-creeping, stout, 4-6 mm. across, terete, somewhat glaucous, nearly naked except for scattered minute scales toward the tip; stipes terete, pale brown to straw-colored, slighdy lustrous, 15-30 cm. long, 2-3 mm. across, glabrous or nearly so; blades herb이:eous, narrowly oblong-ovate, 30-50 cm. long, 10-15 cm. wide, pinnately parted, thinly puberulent on both sides, the rachis short- pilose above; segments 20-30 pairs, horizontally spreading, lin­ear-lanceolate, 1-1.5 cm. wide, acute, nearly entire; costa slen­der, thinly short-pilose on upper side; sori slightly nearer the costa than the margin.   

Kyushu (Yakushima); rare. Formosa.