References from the California Lichen Catalog
- McCLATCHIE, A. J. 1897.
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Seedless plants of southern California. Protophytes — Pteridophytes.
Proceedings of the Southern California Academy of Sciences 1: 363–370.
- TUCKERMAN, E. 1882.
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A synopsis of the North American Lichens.
Pt. 1, Boston.
Complete references section