Irish lichens

Diplotomma pharcidium

Order: Teloschistales       Family: Caliciaceae

Species: Diplotomma pharcidium

Growth type crustose
Photos: Kilmartin Lower, Co. Cork, SW Ireland.
Identified by John Douglass

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) Ám. Microscope photographs below.

Infrequently found on smooth nutrient-rich bark, mainly of Ash and Poplar species. Chemical reactions and UV negative

Similar: Buellia disciformis

Diplotomma pharcidium

Microscope photographs
Diplotomma pharcidium

Diplotomma pharcidium
Diplotomma pharcidium . April 2012

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