Order: Arthoniales       Family: Arthoniaceae Species: Arthonia molendoi Lichenicolous fungus Photos: Drinagh area, Co. Cork, SW Ireland. Correction: Photographs are probably Arthonia parietinaria. Convex black apothecia (0.1-0.3mm) in clusters of 1-5, epithecium black, hypothecium hyaline or straw-coloured. Asci 4-8 spored, spores 1-septate, constricted at septum, cells unequal, 8-11 x 4-6 µm. Scattered distribution on Caloplaca species (and possibly also on Xanthoria parietina).

Arthonia on Xanthoria parietina. December 2011