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This page links to 17 index pages: 16 of them provide links to photos of identified lichens, including those that are identified to genus but not to species. It also links to an index page providing access to about 300 "mystery" lichens that are completely or partially unidentified, and a page that links to topics in lichen natural history. There are about 7,000 photos on the site, illustrating approximately 1,275 species. Most of the photos were taken for the book, Lichens of North America, with text by Dr. Irwin Brodo, published in 2001 by Yale University Press. There are two photos by others. Almost all are from the continental U.S. and Canada, but there are some from Baja California, Mexico, and a few from southern France.

Most of the identifications for the photos were made by Dr. Brodo from voucher specimens that Sylvia Sharnoff and I collected between 1973 and 1998. A smaller number of images were taken by me between 1999 and 2007 and were identified by a number of other lichenologists, including Stephen Clayden, Mariette Cole, Theodore Esslinger, Trevor Goward, James Lendemer, Bruce McCune, Thomas H. Nash III, Roger Rosentreter, and others. Several hundred newer images (and some older ones) of species that occur in California,were identified by Kerry Knudsen, Trevor Goward and Curtis Bjork. A number of lichenologists have also contributed names, or made corrections, from looking at the photos on the website, among them Einer Timdal, Brendan Hodkinson and others. Enormous thanks are due to all who helped! I have attempted to keep the names current with the North American Checklist by Theodore Esslinger, and with other recent sources such as the Lichen Flora of the Greater Sonoran Desert Region. In particular, I owe more than I can express to Ernie Brodo, without whose generosity, energy, and steadfastness our project with lichens would have never developed beyond a passing fancy. Special thanks also to Kerry Knudsen who corrected numerous errors and contributed many new names and information. For the sake of simplicity I have not italicized the scientific names on the website.


A Field Guide to California Lichens, which illustrates and describes approximately 500 species, is available from Yale University Press, or from your local bookstore.

For a description of the book, go to http://yalepress.yale.edu/yupbooks/book.asp?isbn=9780300195002
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I am making corrections to the names and information on the site on an ongoing basis, and adding additional photos from my archives. Most recent revision, with over 500 added photos and new identifications: Feb. 17, 2014.

The informational website about lichens, www.lichen.com is no longer functional at that address, but its contents have been incorporated into this website, at Lichen Information.


Lichens Index 1: Acarospora to Byssoloma alectoria thumbnail graphic
Lichens Index 2: Calicium to Chrysothrix caloplaca thumbnail graphic
Lichens Index 3: Cladonia cladonia_cristatella_2thmb.jpg
Lichens Index 4: Clavascidium to Dypolabia dactylina thumbnail graphic
Lichens Index 5: Echinoplaca to Hypocenomyce evernia thumbnail graphic
Lichens Index 6: Hypogymnia to Lecanora lecanora thumbnail graphic
Lichens Index 7: Lecidea to Megaspora leptogium thumbnail graphic
Lichens Index 8: Melanelia to Orphniospora niebla thumbnail graphic
Lichens Index 9: Pannaria to Peltigera peltigera thumbnail graphic
Lichens Index 10: Peltula to Physcia physcia thumbnail graphic
Lichens Index 11: Physciella to Pseudoparmelia porpidia thumbnail graphic
Lichens Index 12: Psilolechia to Rhizocarpon ramalina thumbnail graphic
Lichens Index 13: Rhizoplaca to Stereocaulon rhizoplaca
Lichens Index 14: Sticta tto Umbilicaria teloschistes thumbnail graphic
Lichens Index 15: Usnea to Xylographa xanthoparmelia thumbnail graphic
Lichens Index 16: Lichen Mysteries unknown lichen thumbnail graphic
Lichen Natural History:
Lichens in the Landscape, Biology, Ecology,
Human Uses, Wildlife Uses
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