Thomson: Lich. Wiscon. Exs.
John Walter Thomson, Jr. [1 - 96 [? 108 Uppsala]]

University of Colorado, Museum of Natural History Herbarium Lichen Collection
Catalog #: COLO-L-0001950
J. W. Thomson #10
Chrysothrix caesia (Flot.) Ertz & Tehler
United States, Wisconsin, Dane, Plot 43:5 University Arboretum, Madison

University of Michigan Herbarium
Catalog #: 74728
J. W. Thomson #s. n. 16 April 1946
Arthonia caesia (Flotow) Körb.
United States, Wisconsin, Dane, Madison, Plot 43:5 University Arborterum

Arizona State University Lichen Herbarium
Catalog #: 527850
J.W. Thomson s.n. 16 April 1946
Allarthonia caesia Flot.
USA, Wisconsin, Dane, Plot 43:5 University Arboretum, Madison

University of Wisconsin - Madison
Catalog #: WIS-L-0111593
John W. Thomson #s.n. 16 April 1946
Allarthonia caesia Flot.
United States, Wisconsin, Dane, Plot 43:5 University Arboretum, Madison

Uppsala University Exsiccati
Catalog #: L-525483
John W. Thomson, Jr s.n. 16 April 1946
Arthonia caesia (Flotow) Körb.
United States, Wisconsin, Dane, Plot 43:5 University arboretum, Madison, Dane Co

University Herbarium, University of California, Berkeley
Catalog #: UC1893317
John W. Thomson, Jr. #S.N. 16 April 1946
Arthrosporum populorum A. Massal.
United States, Wisconsin, Dane, Plot 43:5 University Arboretum, Madison.

Duke University Herbarium Lichen Collection
Catalog #: 216304
Thomson, John W. #s.n. 16 April 1946
Chrysothrix caesia (Flot.) Ertz & Tehler
United States, Wisconsin, Dane, University Arboretum, Madison