Japan Flora: Rhizomes short, stout, erect or ascending, densely covered with the stubs of old stipes; stipes 5-15 cm. long in sterile fronds, 10-30 cm. long in the fertile, acutely trigonous, narrowly winged on the angles while young; sterile blades lanceolate, 25-45 cm. long, 5-12 cm. wide, acuminate, abrupdy contracted at base, with few pairs of reduced flabellate or deltoid often deflexed pinnae, the rachis flat and scarcely raised above, prominently elevated and 2-angled beneath; pinnae of sterile blades 25-32 pairs, herba­ceous, horizontally spreading, linear-lanceolate, acute to short acuminate, widely decurrent, crenate-toothed in lower portion, incurved-toothed toward the tip, the upper pinnae smaller, forming a pinnatilobed terminal pinna with a short tail; fertile fronds erect, with few deflexed pairs of flabellate to deltoid much reduced sterile pinnae at base; fertile pinnae linear, 4-8 cm. long, apiculate, short-petiolulate.

Kyushu (Yakushima). Formosa, China, Indochina, and Philippines.