Ascomycota Incertae sedis
Species: Xanthoriicola physciae
Photos: Co. Cork, SW Ireland.
Brown, septate hyphae immersed in the host apothecia. Dark conidiophores produce warty, brown, globose conidia that turn the apothecia and then the surrounding dead thallus black and 'sooty' in appearance. Conidia 4-6 x 4-6 Ám. Microscope photograph below.
Widespread and can be locally common. Has been recorded on both Xanthoria parietina and X. polycarpa.
Similar: Arthonia molendoi can occur on the thallus of Xanthoria species, the spores are 1-septate