References from the California Lichen Catalog
- HERRE, A. W. C. T. 1907.
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Lichen distribution in the Santa Cruz peninsula, California.
Botanical Gazette 43: 267–273.
- JØRGENSEN, P. M. 2001a (2000).
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Survey of the lichen family Pannariaceae on the American continent, north of Mexico.
The Bryologist 103: 670–704.
- TUCKERMAN, E. 1882.
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A synopsis of the North American Lichens.
Pt. 1, Boston.
Complete references section