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

Arizona State University Lichen Herbarium
Catalog #: 527678
J.W. Thomson s.n. 12 July 1946
Peltigera polydactylon (Necker) Hoffm.
USA, Wisconsin, Marinette, 22.5 km W of Crivitz, Little Falls of the Thunder River, T32N R18E Sec. 8

University of Wisconsin - Madison
Catalog #: WIS-L-0003275
John W. Thomson #s.n. 12 July 1946
Peltigera polydactylon (Necker) Hoffm.
United States, Wisconsin, Marinette, Little Falls of the Thunder River, 14 mi W of Crivitz.

Uppsala University Exsiccati
Catalog #: L-525600
John W. Thomson Jr s.n. 12 July 1946
Peltigera polydactylon (Necker) Hoffm.
United States, Wisconsin, Marinette, 14 miles west of Crivitz, Marinette Co