References from the California Lichen Catalog
- HASSE, H. E. 1897.
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New species of lichens from southern California as determined by Dr. W. Nylander and the late Dr. Stizenberger.
Bulletin of the Torrey Botanical Club 24: 445–449.
- HASSE, H. E. 1898a.
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Lichens of Southern California.
Los Angeles.
Complete references section