Phylum: Ascomycota Family: Dermateaceae
Mollisia cinerea (Batsch) P. Karst.
Common Grey Disco
Very common on dead and rotton hardwoods, especially beech and birch. The apothecia are gregarious and measure up to 2mm across. Occasional larger ones will have an irregular margin
References:
Breitenbach, J. & Kranzlin, F. (1984) Fungi of Switzerland, Volume 1, Ascomycetes
Dennis, R.W.G. (1978) British Ascomycetes
Læssøe, T. & Petersen, J.H. (2019) Fungi of Temperate Europe, Volume 2