References from the California Lichen Catalog
- HASSE, H. E. 1913b.
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The lichen flora of southern California.
Contributions from the United States National Herbarium 17: 1–132.
- WETMORE, C. M. 1996.
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The Caloplaca sideritis group in North and Central America.
The Bryologist 99: 292–314.
Complete references section