References from the California Lichen Catalog
- FINK, B. 1935.
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The lichen flora of the United States.
Ann Arbor.
- HASSE, H. E. 1913b.
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The lichen flora of southern California.
Contributions from the United States National Herbarium 17: 1–132.
- McCLATCHIE, A. J. 1897.
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Seedless plants of southern California. Protophytes — Pteridophytes.
Proceedings of the Southern California Academy of Sciences 1: 363–370.
- THOMSON, J. W. 1984.
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American Arctic lichens. 1. The macrolichens. Columbia University Press, New York.
Pp. 1–504.
Complete references section