References from the California Lichen Catalog

TIBELL, L., & B. D. RYAN. 2004.

Calicium, pp. 39–44; Chaenotheca, pp. 57–61; Chaenothecopsis, pp. 639–641; Cyphelium, pp. 82–88; Microcalicium, pp. 669–673; Phaeocalicium, pp. 399–401; Sphaerophorus, pp. 507–508; Stenocybe, pp. 511–513; Texosporium, pp. 532–533; Thelomma, pp. 533–536, in T. H. Nash III, B. D. Ryan, P. Diederich, C. Gries, & F. Bungartz (eds.), Lichen flora of the Greater Sonoran Desert region, Vol. 2. Lichens Unlimited, Arizona State University, Tempe.