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.
- HERRE, A. W. C. T. 1907.
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Lichen distribution in the Santa Cruz peninsula, California.
Botanical Gazette 43: 267–273.
- HERRE, A. W. C. T. 1910.
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The lichen flora of the Santa Cruz peninsula, California.
Proceedings of the Washington Academy of Sciences 12(2): 27–269.
- PRINTZEN, C., & B. McCUNE. 2004.
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Trapeliopsis, pp. 538–541,
in T. H. Nash III, B. D. Ryan, P. Diederich, C. Gries, & F. Bungartz (eds.), Lichen flora of the Greater Sonoran Desert region, Vol. 2.
Lichens Unlimited, Arizona State University, Tempe.
- TUCKER, S. C., & W. P. JORDAN. 1979 (1978).
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A catalog of California lichens.
Wasmann Journal of Biology 36: 1–105.
- ZAHLBRUCKNER, A. 1902.
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Diagnosen neuer und genügend beschriebener kalifornischer Flechten.
Beihefte zum Botanischen Zentralblatt 13: 149–163.
Complete references section