Japan Flora: Rhi­zomes creeping, glabrous, thinly scaly while young; fronds deciduous; stipes straw-colored, 20-30 cm. long, usually short- pilose, thinly scaly toward the base or nearly naked; scales ovate, 3-4 mm. long, entire, puberulous; blades oblong-lanceo­late, 30-80 cm. long, 10-30 cm. wide, abruptly acuminate, abruptly contracted at base, the rachis usually short-pilose; pinnae rather numerous, broadly linear, 1-2 cm. wide, acumi­nate, acute to obtuse at the tip, sessile, regularly pinnatiparted, sparsely short-pilose on both sides and margin, densely so on costas of both sides; pneumatophores subglobose, at the base of pinnae beneath; pinnules narrowly oblong, 2-3 mm. wide, acute, subfalcate, crenate to subentire, the veins pinnate, the veinlets simple; sori submarginal, in 2 rows on the pinnules; indusia orbicular-reniform, entire, slightly incurved on margin, about 0.5 mm./across. July-Nov.

Honshu (s. Kanto Distr. and westw.), Shikoku, Kyushu. s. Korea, Ryukyus, Formosa, China.