A.  Henssen and Jørgensen, P. Magnus, ?New combinations and synonyms in the Lichinaceae?, The Lichenologist, vol. 22, pp. 137-147, 1990.

B.  McCune and Goward, T., Macrolichens of the Northern Rocky Mountains. Eureka: Mad River Press, 1995.

O.  Gilbert, Lichens. London: HarperCollins, 2000, p. 288.

M.  Schultz and Büdel, B., ?Key to the genera of the Lichinaceae?, The Lichenologist, vol. 34, pp. 39-62, 2002.

T. H.  Nash_, III, Ryan, B. D., Gries, C., and Bungartz, F., Lichen Flora of the Greater Sonoran Desert Region, vol. 1. Tempe: Lichens Unlimited, 2001.

I. M.  Brodo, Sharnoff, S. Duran, Laurie-Bourque, S., and Sharnoff, S., Lichens of North America. Yale University Press, 2001.

M.  Schultz, ?The saxicolous and terricolous, cyanobacterial lichens of Socotra (Yemen, Indian Ocean)?, Nova Hedwigia, vol. 77, pp. 73-97, 2003.

P. M.  McCarthy, ?Checklist of the Lichens of Australia and its Island Territories?, Australian Biological Resources Study, Canberra., 2010.

?Index Fungorum [taxonomy information]?, 2008.

P. D.  Crittenden, Llimona, X., and Sancho, L. G., ?Lichenized unicellular cyanobacteria fix nitrogen in the light?, Canadian Journal of Botany, vol. 87, pp. 1003-1006, 2007.

J. W.  Hinds and Hinds, P. L., The Macrolichens of New England, vol. 96. China: The New York Botanical Garden Press, 2007.