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-0002003
J. W. Thomson #9 01 May 1946
Chrysothrix caesia (Flot.) Ertz & Tehler
United States, Wisconsin, Green, Albany

University of Michigan Herbarium
Catalog #: 74727
J. W. Thomson #s. n. 01 May 1946
Arthonia caesia (Flotow) Körb.
United States, Wisconsin, Green, Albany

Arizona State University Lichen Herbarium
Catalog #: 527849
J.W. Thomson s.n. 01 May 1946
Allarthonia caesia Flot.
USA, Wisconsin, Green, Albany, T3N R9E Sec. 21

University of Wisconsin - Madison
Catalog #: WIS-L-0111592
John W. Thomson #s.n. 01 May 1946
Allarthonia caesia Flot.
United States, Wisconsin, Green, Albany

Uppsala University Exsiccati
Catalog #: L-525482
John W. Thomson, Jr s.n. 01 May 1946
Arthonia caesia (Flotow) Körb.
United States, Wisconsin, Green, Albany, Green Co

University Herbarium, University of California, Berkeley
Catalog #: UC1893314
John. W. Thomson, Jr. #S.N. 01 May 1946
Arthrosporum populorum A. Massal.
United States, Wisconsin, Green, Albany.

Duke University Herbarium Lichen Collection
Catalog #: 216305
Thomson, John W. #s.n. 01 May 1946
Chrysothrix caesia (Flot.) Ertz & Tehler
United States, Wisconsin, Green, Albany