Japan Flora: Rhizomes creeping, about 2.5 mm. across, densely scaly, the scales membranous, deltoid-laiKeolate to narrowly deltoid-ovate, 2.5-4 mm. long, about 1 mm. wide, acuminate, slightly cordate at base, minutely toothed, clathrate, with translucent, elliptic cells and dark brown cell walls; fronds tufted, simple, fleshy, elongate, narrowly linear, 25-50 cm. long, 3-4 mm. wide, nar­rowed to a short obtuse apex, gradually narrowed to a short stipelike base about 2 mm. across, glabrous, entire, with a rounded margin, 1-grooved above, with a raised obtuse promi­nent costa beneath, the veins hidden, anastomosing; sori con­tinuous, in an elongate line along the costa, covered with small peltate paraphyses while very young.  Tree trunks in moun­tains.

Honshu (Mikawa and Hida Prov. and westw.), Shikoku; rare. Formosa, China.