Order: Teloschistales       Family: Caliciaceae Species: Diplotomma pharcidium Growth type crustose. Photos: Kilmartin Lower, Co. Cork and Kilcolman, Co. Limerick, Ireland. Smooth whitish to dark grey thallus usually with a brown prothallus. Apothecia initially flat, sometimes pruinose. Margins thin in young specimens but become thick and prominent. Spores often slightly curved, 3-septate becoming sub-muriform with the longitudinal divisions only on either side of the central septum, 16-19(-23) x 6.5-8.5(-9.5) µm. Microscope photographs below. Infrequently found on smooth nutrient-rich bark, mainly of Ash and Poplar species. Chemical reactions and UV negative Similar: Buellia disciformis

Microscope photographs





Diplotomma pharcidium . April 2012, August 2024