Japan Flora: Rhizome creeping, scaly, 2-2.5 mm. across; fronds slender; stipes 10-15 cm. long, 1-1.5 mm. across, purple-brown to dark brown, lustrous, smooth except at base; scales on rhizomes and at base of stipes lanceolate, 3-4 mm. long, long-acuminate, spreading, black­brown, minutely spinulose near tip; blades broadly linear to linear-lanceolate, 20-40 cm. long, 3-4 cm. wide, gradually long-acuminate, slightly narrowed at base, smooth, simply pinnate, the rachis lustrous, sulcate on upper side; pinnae rather many, thinly herbaceous to  membranous, semiovate, 5-8 mm. wide, obtuse, somewhat dimidiate，spreading, sub- sessile, nearly straight from base to the top, entire on posterior margin except for 1 or 2 teeth near tip, the anterior side toothed, nearly straight to slightly arcuate, broadly cuneate at base; teeth on sterile pinnae mostly regular, ovate, subobtuse; fertile pinnae slightly larger, often bidentate at the tip, the costa very slender, close to the posterior margin, pinnately veined on anterior side, the median ones once-forked, ending in a tooth; sori on the teeth, few to a pinna; indusia 1.5-2.5 mm. long. 

Kyushu (Yakushima and Tanegashima). Formosa, China, Indochina to India, and Malaysia.