References from the California Lichen Catalog

HASSE, H. E. 1906.

Contributions to the lichen flora of southern California. Bulletin of the Southern California Academy of Sciences 5: 38–45.

PRINTZEN, C. 1995.

Die Flechtengattung Biatora in Europa. Bibliotheca Lichenologica 60: 1–275. J. Cramer, Berlin.