Order: Lecanorales Family: Mycoblastaceae
Species: Mycoblastus caesius
Photos: Glengarriff woods, Co. Cork, SW Ireland.
Identified by Andy Acton
Thin bluish-grey thallus, usually with a darker blue-grey prothallus. Numerous whitish to pale bluish-grey soralia with deeper blue flecks, discrete but can become confluent. Apothecia and pycnidia are unknown. Chemical reactions negative, UV+ white.
Found on rough or smooth acidic bark in old, established woodlands, occasional on shaded siliceous rocks.
Similar: Buellia griseovirens
Mycoblastus caesius March 2010