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. 1915b.
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Additions to the lichen flora of southern California. No. 11.
The Bryologist 18: 92–94.
- ZAHLBRUCKNER, A. 1925.
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Catalogus Lichenum Universalis, Vol. III.
Leipzig, Berlin.
Complete references section