Tephromela atra

Tephromela atra

Observation - Tephromela atra - UK and Ireland. Description: Growing on siliceous rock in the splash zone, a grey crustose lichen with abundant lecanorine apothecia ranging in size from mere dots to about 2mm. Picture 2 although not well focussed gives some idea of scale. Thallus is cracked, warty and where there a

Growing on siliceous rock in the splash zone, a grey crustose lichen with abundant lecanorine apothecia ranging in size from mere dots to about 2mm. Picture 2 although not well focussed gives some idea of scale. Thallus is cracked, warty and where there are few apothecia, not unlike a cauliflower head to look at! It tests K+ pale yellow turning rapidly to pale yellow-green. I think in spite of the lumpiness of some areas, that it is Tephromela atra. Some of the lumpier parts were washed off in the recent gales.