References from the California Lichen Catalog
- HASSE, H. E. 1896.
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Lichens of the vicinity of Los Angeles II–IV.
Erythea 4: 96–98, 106–108, 150–157.
- 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.
- ORCUTT, C. R. 1903.
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Southern California lichens.
The West American Scientist 14(3): 17–22; 14(4): 25–28.
- ORCUTT, C. R. 1907.
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Botany of southern California. Lichens.
American Plants, 1: 240–245, 367–372.
- TUCKERMAN, E. 1888.
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A synopsis of the North American Lichens, Pt. 2, comprising of the Lecidacei, and (in part) the Graphidacei.
E. Anthony & Sons, Printers, New Bedford. 176 pp.
- ZAHLBRUCKNER, A. 1927.
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Catalogus Lichenum Universalis, Vol. IV.
Leipzig, Berlin.
Complete references section