References from the California Lichen Catalog
- RYAN, B. D., H. T. LUMBSCH, M. I. MESSUTI, C. PRINTZEN, L. SLIWA, & T. H. NASH III. 2004.
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Lecanora, pp. 176–286,
in T. H. Nash III, B. D. Ryan, P. Diederich, C. Gries, & F. Bungartz (eds.), Lichen flora of the Greater Sonoran Desert region, Vol. 2.
Lichens Unlimited, Arizona State University, Tempe.
- RYAN, B. D., & T. H. NASH III. 1997.
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Systematics of Lecanora subgenus Placodium (lichenized Ascomycotina) in North America: an overview, with keys.
Nova Hedwigia 64: 111–127.
- 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