Sphaerellothecium araneosum

Sphaerellothecium araneosum has been reported from the highlands of Iceland^[2] and the Arctic desert of Severnaya Zemlya in Russia.^[3]

Sphaerellothecium araneosum commonly grows on species of Ochrolechia, such as Ochrolechia frigida^[2] but it also grows on Stereocaulon rivulorum and Stereocaulon vesuvianum, on which it causes no known symptoms.^[3] It is common in Cladonia pocillum and Cladonia symphycarpia, and less common but present in Cladonia coccifera, Cladonia gracilis, Cladonia macroceras, Cladonia pyxidata and Cladonia subcervicornis. The population infecting Cladonia is considered a separate variety from other Sphaerellothecium araneosum.^[4]