References from the California Lichen Catalog
- GOWARD, T. 1999.
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The Lichens of British Columbia. Part 2. Fruticose species. Special Report ser. 9.
British Columbia Ministry of Forests, Crown Publications Inc., Victoria, B. C., Canada.
- PETERSON, E. B., & J. RIKKINEN. 1999.
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Range extensions of selected pin-lichens and allied fungi in the Pacific Northwest.
The Bryologist 102: 370–376.
- WETMORE, C. M. 1985.
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Lichens and air quality in Sequoia National Park.
Final Report, (U. S.) National Park Service Contract CX 0001–2-0034.
Complete references section