For a collector in Miyanosh'ta, Japan, Mr. Bissett, otherwise unidentified by J.G. Baker.
Rhizome: short-creeping, clumping, scaly.
Frond: 45 cm high by 30 cm wide, evergreen, monomorphic, blade/stipe ratio: 3:1 to 1:2.
Stipe: grooved, scales black, narrow triangular, vascular bundles: 3-7 in a c-shaped pattern.
Blade: 3-pinnate only at the base, deltate-ovate to lanceolate, leathery, embossed upper surface, costa with small bullate scales below.
Pinnae: 15 to 20 pair, lowest pinnae anadromous; pinnules triangular, curved outwards, almost entire above to pinnate below, the first lower pinnule of the lowest pinnae twice the lenth of the first upper pinnule; costae grooved above, continuous from rachis to costae; margins serrate, slightly reflexed; veins free, forked, visible on both surfaces.
Sori: round, submarginal to medial, ultimate segments each bearing one sorus, indusium: reniform, greenish at maturity, attached at a sinus, sporangia: brownish, maturity: fall.
Habitat: forest floor, edge of mountain forests.
Distribution: Japan, Korea, China.
Hardy to -25°C, USDA Zone 5.
Nephrodium bissetianum Baker
Polypodium setosum Thunb
Dryopteris varia (L.) Kuntze var. setosa (Thunb.) Ohwi
Polystichum bissetianum Nakai
Polystichum sacrosanctum Koidzumi, misapplied