References from the California Lichen Catalog
- SIERK, H. A. 1964.
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The genus Leptogium in North America north of Mexico.
The Bryologist 67: 245–317.
- THOMSON, J. W. 1984.
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American Arctic lichens. 1. The macrolichens. Columbia University Press, New York.
Pp. 1–504.
- 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