Lichens - Smith, Annie Lorrain, 1854 - (Univ. Press, 1921)

Lichens (29) : management recommendations for survey and manage - United States. Bureau of Land Management. (U.S. Department of Agriculture, Forest Service, 2000)

Lichens de la région d'Ottawa - National Museum of Natural Sciences (Canada) (Musée national des sciences naturelles, 1990)

The lichens of Alaska - Cummings, Clara E. (Clara Eaton), 1855 -1906 (Smithsonian Institution, 1910)

The lichens of Long Island, New York: a vegetational and floristic analysis - Brodo, Irwin M. (Irwin Murray), 1935 - (University of the State of New York, 1968)