Japan Flora: Rhizomes slender, long-creeping, 2-3 mm. across, short-pilose, scaly toward tip, black-brown; scales brown, linear-lanceolate, 2-5 mm. long, entire, short-puberulent; stipes slender, straw-colored to pale brown, scaly toward base, short-pilose especially on upper portion, 7-20 cm. long in sterile fronds, to 40 cm. long in the fertile; blades with 1-3, rarely 5 simple pinnae; terminal pinna of sterile blades thinly chartaceous, broadly lanceolate to broadly oblong-lanceolate, 10-22 cm. long, 2.5-4 cm. wide, long-acuminate, sometimes subcordate or rounded at base, undulate or entire, pinnately veined, short-pilose on the costas of both sides, the petiolule about 1 cm. long; terminal pinna of fertile blades usually lanceolate; lateral pinnae of sterile and fertile blades usually smaller, 1/4 to 1/3 as long as the terminal pinna, sometimes greatly reduced and adnate to the base of the terminal pinna; veins obliquely spreading, parallel, slighdy arcuate, raised especially beneath, the venation menis- scioid, i.e. the opposite veinlets uniting and sending out an excurrent veinlet, this often meeting the adjacent veinlets, thus forming two rows of areoles between the main veins; sori on the veinlets, linear to oblong, the sporangia with 1-3 hispid hairs (under magnification); indusia absent.

Kyu­shu (Yakushima). Ryukyus, Formosa, s. China to India, Malaysia to Australia.