Order: Arthoniales Family: Arthoniaceae
Species: Arthonia molendoi
Photos: Drinagh area, Co. Cork, SW Ireland.
Identified by Brian Coppins
Convex black apothecia (0.1-0.3mm), epithecium black, hypothecium hyaline or straw-coloured. Asci 4-8 spored, spores 1-septate, constricted at septum, cells unequal, 8-11 x 4-6 Ám.
Scattered distribution, occurs on Caloplaca and Xanthoria species. Only recently separated from A. epiphyscia.
Shown here on the thallus of Xanthoria parietina
Arthonia molendoi on Xanthoria parietina. December 2011