Monographs Details: Marsupella revoluta (Nees) Dumort.
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.
Family:Gymnomitriaceae
Discussion:The ecology and known distribution of this species have been discussed by Horton (1977). It occurs in acidic seeps and in moist depressions in acidic tundra, often with Anastrophyllum minutum. This latter species extends south to Vancouver Island along coastal British Columbia, whereas M. revoluta is found southward only to northeastem British Columbia (near Mt. Edziza—Horton, 1977). We can now report three additional specimens that extend the range of M. revoluta southward to the ice-free corridor region of Alberta and southeastem British Columbia.—CANADA. British Columba: Glacier National Park (Canada), Glacier Circle, Scotter 68765 (alta); Alberta: Mountain Park Divide, Vitt 30821 (alta), Jasper National Park, Mt. Edith Cavell, Horton 15106 (alta)—New to Alberta. The largely coastal distribution oi Anastrophyllum assimile is distinctive from the more continental (interior) pattem of M. revoluta. Both of these species are restricted to moist, siliceous substrates.