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

University of Michigan Herbarium
Catalog #: 112567
J. W. Thomson #s. n.
Masonhalea richardsonii (Hook.) Kärnefelt
United States, Alaska, valley of the Okpilak River at Okpilak Lake near Mt. Michelson

University of Wisconsin - Madison
Catalog #: WIS-L-0109585
John W. Thomson #s.n. 02 August 1958
Masonhalea richardsonii (Hook.) Kärnefelt
United States, Alaska, North Slope, Northern Alaska, valley of the Okpilak River at Okpilak Lake near Mt Michelson

Uppsala University Exsiccati
Catalog #: L-160641
John W. Thomson & S. Shushan s.n. 02 August 1958
Masonhalea richardsonii (Hook.) Kärnefelt
United States, Alaska, Northern Alaska, valley of the Okpilak River at Okpilak Lake near Mt Michelson

Duke University Herbarium Lichen Collection
Catalog #: 0299138
Thomson, John W. #s.n. 00 August 1958
Masonhalea richardsonii (Hook.) Kärnefelt
United States, Alaska, North Slope, Valley of the Okpilak River at Okpilak Lake near Mount Michelson