Thomson: Lich. Arct.
John Walter Thomson [1 - 115]

University of Michigan Herbarium
Catalog #: 112563
J. W. Thomson #s. n.
Masonhalea richardsonii (Hook.) Kärnefelt
Canada, Northwest Territories, Artillery Lake, at Rat Lodge, west side of Artillery Lake

University of Colorado, Museum of Natural History Herbarium Lichen Collection
Catalog #: COLO-L-0026076
John W. Thomson #89 16 July 1962
Masonhalea richardsonii (Hook.) Kärnefelt
Canada, Northwest Territories, Artillery Lake, Rat Lodge, W side of the lake

University of Wisconsin - Madison
Catalog #: WIS-L-0109605
John W. Thomson #s.n. 16 July 1962
Masonhalea richardsonii (Hook.) Kärnefelt
Canada, Northwest Territories, Artillery Lake, Rat Lodge, W side of the lake

Uppsala University Exsiccati
Catalog #: L-160661
John W. Thomson & J.A. Larsen s.n. 16 July 1962
Masonhalea richardsonii (Hook.) Kärnefelt
Canada, Northwest Territories, Artillery Lake, Rat Lodge, W side of the lake

Duke University Herbarium Lichen Collection
Catalog #: 0299151
Thomson, John W. #s.n. 00 July 1962
Masonhalea richardsonii (Hook.) Kärnefelt
Canada, Northwest Territories, At Rat Lodge, W side of Artillery Lake