Monographs Details: Marsupella arctica (Berggr.) Bryhn & Kaal.
Authority: Buck, William R. 1987. Bryostephane Steereana: A Collection of Bryological Papers Presented to William Campbell Steere On The Occasion of His 80th Birthday. Mem. New York Bot. Gard. 45: 1-749.
Discussion:New to the Yukon. This species was previously known from Spitzbergen, northem Scandinavia, Greenland, Ellesmere Island (Schuster, 1974) and the Central Yukon District (Salcha River) and Bering Strait area (Ogotoruk Creek) of Alaska (Persson & Holmen, 1961). Steere and Inoue (1978) added another station from arctic Alaska. The Keele Peak station for this species is the first westem Canadian collection, disjunct 750 km from the Salcha River site in eastcentral Alaska. At Keele Peak, M. arctica was found at an elevation of 1600 meters along seepy granite cliffs, just below Glacier 99 in lush alpine tundra. Associated bryophytes included Plagiothecium cavifolium, Pohlia longicollis, P. crudoides, Rhizomnium andrewsianum, Odontoschisma macounii, Scapania spitzbergensis, Isopterygiopsis muelleriana, Marsupella emarginata, M. revoluta, Amphidium lapponicum and Cynodontium tenellum.