Japan Flora: Fronds dimorphic, glabrous, evergreen; rhizomes small, short, with dark purple-brown, lustrous, broadly linear scales, about 】 mm. long; stipK firm, slender, obtusely angled, lustrous, brown, paler on the angles, 0.7-1 mm. across, 3-12 cm. long in the sterile fronds, 5-25 cm. long in the fertile; blades ternate or sometimes with a pair of remote pinnae at base, the rachis not winged; sterile pinnae chartaceous to thinly coriaceous, lanceolate to oblong-ovate, 2-7 (-10) cm. long, 7-12 mm. wide, obtuse, the lower ones sometimes 2-parted, the fertile pinnae linear, 斗-15 cm. long, 3-4 mm. wide.  Stone walls.

Kyushu (s. distr.); rare. Ryukyus.