Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.

Pseudothecia: globose, 170-250 µm diam. ascomatal wall: colorless in its lower half part and green-blue around the ostiole, basally 20-30 µm thick paraphysoids: abundant, 1-1.5 µm thick asci: (60-)65-80 x 9-11 µm, cylindrical, constantly 4-spored (Sonoran specimens) ascospores: (14.5-)15.5-19.5(-23) x (4.5-)5-6(-7) µm, 1-septate, narrowly ellipsoid or fusiform, with both cells ± equal in shape and size or lower cell slightly narrower, with the septum centered, not constricted at the septum, halonate. Hosts: parasymbiotic on Megaspora mutabilis and M. verrucosa World distribution: Europe and North America Sonoran distribution: Arizona and Chihuahua. Notes: The fact that the type of Cercidospora verrucosaria could not be found in W.L. Lindsay's herbarium in E (Hawksworth 1985, Hawksworth & Diederich 1988), has made the understanding of this taxon somewhat difficult.