The lichen-flora of Great Britain, Ireland, and the Channel Islands - Leighton, William Allport, 1805 -1889 (1879)

Lichen flora of Lincolnshire - Seaward, M. R. D. (1980)

The lichen flora of the Santa Cruz Peninsula, California - Herre, Albert W. (Albert William), 1868 -1962 (Washington academy of sciences, 1910)

The lichen flora of the United States - Fink, Bruce, 1861 -1927 (University of Michigan Press, 1935)

The Lichen Genus Peltigera (Lichenized Ascomycetes) in Alberta - Provincial Museum of Alberta. Natural History Section. (Curatorial Section, Provincial Museum of Alberta, 1994)

Lichenaea Africana - Stizenberger, Ernst, 1827 -1895 (In Commission bei A. & J. Köppel, 1890)

Die lichenen Heidelbergs nach dem systeme und den bestimmungen Dr. William Nylanders - Zwackh-Holzhausen, Wilhelm Ritter von. (G. Weiss, 1883)

Lichenes Americani : quos partim in Flora Indiae Occidentalis descripsit, partim e regionibus diversis Americae obtinuit - Sturm, Jakob, 1771 -1848 (J. Sturm, 1811)