Japan Flora: Fronds glabrous，evergreen; rhizomes short, creeping or as­cending, firm，densely leafy, while young with red-brown lus­trous linear-lanceolate scales about 1.5 mm. long; stipes 2-20 cm. long, dark purple-brown, lustrous, 4-angled, smooth, sparsely scaly at the base; blades broadly lanceolate^ simply pinnate, 8-20 cm. 1ong3 2-3 cm. wide, or bipinnate and nar­rowly triangular, 5-12 cm. wide, gradually acuminate in larger fronds, the rachis 4-angled, lustrous, pale green or often purple-brown beneath on lower half; pinnules chartaceous- herbaceous, elliptic, squarrose or ovate, 8-20(-25) mm. long, 4-10(-13) mm. wide, oblique, rounded to very obtuse, broadly cuneate at base, short-petiolulate, entire and nearly at right angles to the axis on the lower margin, acutely toothed and/or lobulate toward the tip, palmately veined; sori usually inter­rupted, short; indusia narrow, marginal. 

Honshu (Izu Pen. and Izu Isis, through Tokaido to s. Kinki Distr.)  Shikoku, Kyushu; rather rare. Ryukyus, Formosa, China, and Indo­china. Polymorphic.

var. deltoidea Wu. Terminal pinnaelongate-rhombic, lobulate, large. Honshu (Kii Prov.), Kyushu. Ryukyus, Formosa, and China.