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.
- FINK, B. 1935.
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The lichen flora of the United States.
Ann Arbor.
- HASSE, H. E. 1898a.
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Lichens of Southern California.
Los Angeles.
- HASSE, H. E. 1913b.
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The lichen flora of southern California.
Contributions from the United States National Herbarium 17: 1–132.
- 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