Probably named for the disjunct distribution in northeastern Asia and northwestern North America.
Rhizome: long-creeping, dark brown, forking.
Frond: 40 cm high by 15 cm wide, deciduous, monomorphic, blade/stipe ratio: 2:1 to 3:1.
Stipe: grooved, straw-colored, darker, purplish at the base, scaly at base, vascular bundles: 2, oblong.
Blade: 3-pinnate pinnatifid, triangular to pentagonal, herbaceous, vivid green, only a few glands below.
Pinnae: 6 to 10 pair, the lowest pair each similar to the remainder of the blade, only slightly smaller; margins entire to crenate; veins free, simple or forked.
Sori: round, in 1 row between midrib and margin, indusium: absent, sporangia: brownish.
Dimensionality: blade displayed horizontally.
Distribution: northeastern Asia (Sakhalin Island, Kamchatka) and northwestern North America (Alaska to Oregon and Idaho).
Hardy to -30°C, USDA Zone 4.
Larger than G. dryopteris and more divided.
Polypodium disjunctum Rupr.
Dryopteris disjuncta (Rupr. ex Schur) Morton
Gymnocarpium dryopteris (L.) Newman ssp. disjunctum (Rupr.) Sarvela