Japan Flora: Intermediate be­tween A. wilfordii and A. yoshinagae but differing in the bipinnate blades; rhizomes short-creeping to ascending, with many stipes, the scales linear-lanceolate, 4-6 mm. long, long-acumi­nate, entire, dark brown； stipes 5-15 cm. long, 1.5-2 mm. across, green, slightly flattened, sulcate on upper side, often dull purplish beneath, sparsely scaly, the scales spreading, deciduous, broadly linear, 2-3 mm. long; blades broadly lanceolate, 10-20 cm. long, 3.5-7 cm. wide, acuminate, bipinnate; pinnae 10-15 pairs, deltoid-ovate, 2-5 cm. long, 1.5-2.5 cm. wide, acute to acuminate with an obtuse tip, obliquely spreading, the petio- lules 2-7 mm. long; pinnules firmly herbaceous, 5-15 mm. long, 2-5 mm. wide, cuneate at base, sessile, ascending, unlobed or slightly incised, entire except for a few obtuse teeth at the subtruncate tip, the costules and veins slender, nearly parallel; sori few on a pinnule; indusia 2-6 mm. long, straight.

Honshu (Musashi, Suruga, Hida, Tanba Prov.); rare.