References from the California Lichen Catalog
- BREUSS, O. 2002.
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Catapyrenium, pp. 125–128; Clavascidium, pp. 158–159; Endocarpon, pp. 181–187; Placidiopsis, pp. 383–384; Placidium, pp. 393–394; Placopyrenium, pp. 394–397; Thrombium, pp. 483–484,
in T. H. Nash III, B. D. Ryan, C. Gries, & F. Bungartz (eds.), Lichen flora of the Greater Sonoran Desert region, Vol. 1.
Lichens Unlimited, Arizona State University, Tempe.
- BREUSS, O., & C. BRATT. 2001 (2000).
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Catapyrenioid lichens in California.
Bulletin of the California Lichen Society 7: 36–43.
- FINK, B. 1935.
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The lichen flora of the United States.
Ann Arbor.
- HASSE, H. E. 1897.
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New species of lichens from southern California as determined by Dr. W. Nylander and the late Dr. Stizenberger.
Bulletin of the Torrey Botanical Club 24: 445–449.
- HASSE, H. E. 1915b.
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Additions to the lichen flora of southern California. No. 11.
The Bryologist 18: 92–94.
- HERRE, A. W. C. T. 1910.
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The lichen flora of the Santa Cruz peninsula, California.
Proceedings of the Washington Academy of Sciences 12(2): 27–269.
- KNUDSEN, K. 2004c (2003).
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Three notable lichen collections and their relationship to lichen distributions in southern California.
Crossosoma 29: 37–40.
- ROBERTSON, J. 2003b.
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CALS field trip to UC White Mountains Research Station July 11–13, 2003.
Bulletin of the California Lichen Society 10: 42–45.
- SIGAL, L. L., & D. R. TOREN. 1976 (1975).
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New distribution records of lichens in California. II.
The Bryologist 78: 467–469.
- THOMSON, J. W. 1987.
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The lichen genera Catapyrenium and Placidiopsis in North America.
The Bryologist 90: 27–39.
- TUCKER, S. C., & W. P. JORDAN. 1979 (1978).
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A catalog of California lichens.
Wasmann Journal of Biology 36: 1–105.
Complete references section