Species: Collemopsidium foveolatumPreviously known as Pyrenocollema halodytes
Growth type crustose.
Photos: On barnacles. Snave beach, Cork, SW Ireland.
Immersed thallus with very small perithecia (fruiting bodies) that are immersed in pits in the shells of barnacles or limpets. Perithecia are black, flattened or +/- convex.
Maritime, on limpet or barnacle shells and coastal calcareous rock.
Collemopsidium foveolatum on barnacles. Bantry Bay, Co. Cork. February 2009