References from the California Lichen Catalog

ERTZ, D., P. DIEDERICH, & J. MIADLIKOWSKA. 2004.

The lichenicolous Opegrapha species (Roccellaceae, Ascomycota) with 3-septate ascospores on Pertusaria and Ochrolechia. Botanical Journal of the Linnean Society 144: 235–241.