Japan Flora: Stipes 20-40 cm. long, 25-3 mm. wide at base, straw-colored in up­per part, darker at base, rather densely scaly, the scales brown, the lower ones often blackish, 5-12 mm. long, long-acumi­nate, ciliate-toothed, the basal ones narrowly ovate, to 15 mm. long, about 5 mm. wide; blades firmly coriaceous, narrowly ovate-oblong, 30-45 cm. long, 10-20 cm. wide, acuminate, bi­pinnate, the scales of the rachis gradually long-acuminate, slightly falcate, lanceolate, ciliate, 4-6 mm. long; pinnae lanceo­late, 15,25 mm. wide, the lower ones very short-petiolulate; pinnules obliquely ovate, 10-12 mm. long, 4-7 mm. wide, acute with a firm spine at the tip, spine-toothed to subentire, glabrous on upper side, witli scattered filiform-tipped scales beneath, decurrent on the narrowly winged rachis; sori in 2 series on the pinnules, between the costule and the margin; indusia caducous, membranous, about 1.5 mm. across, impressed in the center.

Honshu (Kanto Distr. and westw.).