Athyrium distentifolium subsp. americanum (Butters) Hultén
Publ. & Syn.Hultén, Bot. Not. 126: 462 (1973). - Athyrium alpestre var. americanum Butters, Rhodora 19: 204 (1917). Lectotype (GH): Canada: British Columbia, Selkirk Mountains, Rogers Park, 23. Aug. 1904, leg. Heacock 554. (Maxon 1918: 120). - Athyrium americanum (Butters) Maxon, Amer. Fern J. 8: 120 (1918). - Athyrium distentifolium var. americanum (Butters) Cronquist, Vasc. Pl. Pacific Northwest 1: 63 (1969). - Athyrium alpestre subsp. americanum (Butters) Lellinger, Amer. Fern J. 71: 91 (1981).
NotesSe Kartesz and Gandhi (1991) for a survey of characters separating the two taxa we enter as subspecies, and their arguments for rank as species. Subspecies americanum does not reach the Arctic in mainland North America.
Chromosomes80 (4x). - Far East, Canada. - Taylor and Lang (1963); Mitui (1976).
GeographyAmphi-Pacific & North American (E): GRL.
Distribution N = F     GW = r     D = ?     E = S     GE = r     [ key ]
Parent taxonAthyrium distentifolium Tausch ex Opiz
PAF ID090202b
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Panarctic Flora Editor-in-Chief: Reidar Elven (Natural History Museum, University of Oslo)
Editorial Committee: Reidar Elven, David F. Murray (Museum of the North, University of Alaska), Volodya Yu. Razzhivin (Komarov Botanical Institute, Russian Academy of Sciences), Boris A. Yurtsev [deceased] (Komarov Botanical Institute, Russian Academy of Sciences)