Order: Verrucariales       Family: Verrucariaceae Species: Verrucaria hochstetteri Growth type crustose. Photos: On limestone rocks. The Burren, W Ireland. BLS Burren meeting 2009 Smooth white to pale grey thallus. Large sunken perithecia leaving conspicuous pits in rock when they decay. Common throughout Ireland on hard limestone and mortar. Chemical reactions negative. Similar: Verrucaria baldensis. Smaller perithecia.

Verrucaria hochstetteri. BLS Burren meeting, April 2009