Order: Pyrenulales Family: Monoblastiaceae
Species: Acrocordia conoidea
Photos: On limestone. Black Head and Temple Cronan, the Burren, Ireland. BLS meeting April 2009
Smooth or finely granular, pale grey or brownish-grey thallus, often tinged pink. Many large spherical discs, leaving conspicuous pits in thallus. Apices +/- flattened, ostiole projecting. Pycnidia frequent. Chemical reactions negative.
Can be abundant on natural hard limestone, also on limestone memorials in old churchyards.
Similar: Acrocordia salweyi
Acrocordia conoidea. The Burren. April 2009