Japan Flora: Rhi­zomes long-axeping, densely scaly toward the tip, 5-10 mm. across, the scales membranous, linear-lanceolate, 5-6 mm. long, gradually acuminate, sparsely toothed, clathrate; stipes 40-70 cm. long, 4-7 mm. across, naked except for a few withered scales toward base, straw-colored; blades narrowly ovate, 40-60 cm. long, simply pinnate, the rachis winged in upper part; pinnae thinly herbaceous, 7-11 pairs, obliquely spreading to ascending, linear-lanceolate to broadly linear, 12-25 cm. long, the fertile 1-2 cm. wide, the sterile to 3 cm. wide, gradually narrowed to the subcaudate tip, narrowed at base, more or less decurrent on the rachis, entire or undulate; costa more prominently raised beneath, the veins and veinlets very slen­der, usually slighdy raised on both sides; sori linear, 1-1.8 cm. long, obliquely ascending to spreading. Moist woods along streams.

Shikoku, Kyushu. Ryukyus, Formosa, China to India, and Philippines.