Order: Verrucariales       Family: Verrucariaceae Species: Placydium squamulosum Previously Catapyrenium squamulosum. Growth type squamulose. Photos: On limestone. Black Head, the Burren, and Askeaton, Co. Limerick, Ireland. BLS Burren meeting 2009 Adpressed squamules are buff to red-brown with felted black undersides. Immersed brown perithecia with blackish ostioles. Local, often coastal distribution in Ireland in crevices in hard calcareous rocks and walls. Also on mortar and calcareous soil. Chemical reactions negative

Immediately above Placydium squamulosum Askeaton, July 2009. Identified by B Coppins