100101 Dryopteris expansa (C. Presl) FraserJenk. & Jermy
Distribution
Northern Iceland: Scattered
Northern Fennoscandia: Frequent
Kanin - Pechora: Scattered
Yamal - Gydan: Present only in the Borderline Arctic
Taimyr - Severnaya Zemlya: Rare
West Chukotka: Rare
East Chukotka: Rare
Western Alaska: Scattered
Northern Alaska - Yukon: Rare
Hudson Bay - Labrador: Rare
Western Greenland: Scattered
Eastern Greenland: Rare
Southern Arcti Tundra: Rare
Shrub Tundra: Frequent
Bordering boreal or alpine areas: Frequent
- Fraser-Jenk. & Jermy, Brit. Fern Gaz. 11: 338 (1977). - Nephrodium expansum C. Presl, Reliq. Haenk. 1: 38 (1825). Described from western North America, probably British Columbia (Canada).
- Lastrea dilatata var. alpina Moore, Handb. Brit. Ferns, ed. 3: 126 (1857). Described from the British Isles. - Dryopteris assimilis S. Walker, Amer. J. Bot. 48: 607 (1961). Nomen novum for Lastrea dilatata var. alpina Moore.
- Aspidium spinulosum var. americanum Fisch. ex Kunze, Amer. J. Sci. 2, 6: 84 (1848). Described from Newfoundland (leg. Pylaie), Greenland and Labrador (leg. Breutel and Kurr), New England mountains (leg. Tuckerman), Black Mountains in North Carolina (leg. Rugel), and specimens cultivated in St. Petersburg (leg. Fischer). - Dryopteris dilatata subsp. americana (Fisch. ex Kunze) Hultén, Ark. Bot., n. s., 7, 1: 4 (1968).
- Dryopteris dilatata auct., non (Hoffm.) Gray (1848).
- Dryopteris austriaca auct., non Woyn. ex Schinz & Thell. (1915).
2n=
82 (2x). - Europe, Canada, U.S.A. - Numerous reports.
Geography: Amphi-Pacific - North American (N) - amphi-Atlantic - European - Asian (W): ICE NOR RUS SIB RFE ALA CAN GRL.
Notes: Tzvelev: North American Dryopteris expansa and European D. assimilis differ in, e.g., absence vs. presence of frond glands and in the shape and size of petiole scales.
Elven: Comparing Eurasian and North American specimens, I agree that there is a difference in glands (but North American plants often have a few frond glands), but I do not find enough difference to justify two species.
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Source: Don Pedro28 at Wikispecies
Higher Taxa
- Dryopteris [1001,genus]