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.
- HASSE, H. E. 1903a.
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Contributions to the lichen flora of the California coast islands.
Bulletin of the Southern California Academy of Sciences 2: 23–26.
- ORCUTT, C. R. 1903.
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Southern California lichens.
The West American Scientist 14(3): 17–22; 14(4): 25–28.
Complete references section