Japan Flora: Rhizomes short-creeping to suberect, densely clothed with the stubs of old stipes; fronds dimorphic; stipes of sterile fronds 3-10 cm. long, puncticulate, the scales rather sparse, brown, broadly linear, 3-8 mm. long, entire; blades lanceolate, 15-35 cm. long, 3.5-6 cm. wide, narrowed at both ends, obtuse at the tip, pinnately divided nearly to the rachis, glabrous, the rachis deeply sulcate on upper side, puncticulate on both sides; pinnae spreading, linear-oblong, 斗-7 mm. wide, rounded with an obtuse mucro at the tip, subentire, the costa more or less distinct beneath, the lower pinnae semirounded, 3-6 mm. long, 5-8 mm. wide; veins mostly once-forked, scarcely visible; fertile fronds much longer than the sterile, the blades with few nearly obsolete distant sterile pinnae at base; fertile pinnae linear, 15-30 mm. long, 1.5-2 mm. wide, obliquely spreading, spaced out, abruptly dilated and decurrent on the rachis. Woods in mountains.

Honshu (centr. and n. distr.)