Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Pseudothecia: globose, 120-160(-200) µm diam. ascomatal wall: in the upper part blue-green, basally hyaline, c. 10 µm thick paraphysoids: relatively abundant, 1.5-2(-2.5) µm wide asci: (50-)60-80 x (10-)12-13 µm, cylindrical-clavate, (4-6-)8-spored ascospores: hyaline, simple, ellipsoid to fusiform, heteropolar, with a narrower lower part, with a thin sheath especially visible in the youngest ascospores, guttulate, (13-)16-21.5(-24) x (4.5-)5-6 µm Pycnidia and conidia: not observed. Hosts: parasymbiotic on the thallus of Lobothallia spp. World distribution: Mediterranean Europe and western North America Sonoran distribution: California. Notes: Cercidospora lobothalliae differs from the other species of Cercidospora by the aseptate ascospores. The occurrence of some simple ascospores can be observed in other species of the genus, e. g., on C. crozalsiana, a fungus growing on different Squamarina species (Navarro-Rosin's et al. 1995), but in this case the simple ascospores are scarce in comparison with the 1-septate ones. Another remarkable character of C. lobothalliae is the small size of the ascomata, which are the smallest of all species treated here. The existence of a additional Cercidospora species on Lobothallia underlines that these aspicilioid lichens should be kept as a separate genus.