References from the California Lichen Catalog

TUCKERMAN, E. 1877.

Observations on North American and other lichens. No. 4. Proceedings of the American Academy of Arts and Sciences 12: 166–185.

TUCKERMAN, E. 1888.

A synopsis of the North American Lichens, Pt. 2, comprising of the Lecidacei, and (in part) the Graphidacei. E. Anthony & Sons, Printers, New Bedford. 176 pp.