Family: Acarosporaceae
Myriospora smaragdula (Wahlenb.) Nägeli ex Uloth
Type: Crustose
Widespread and quite variable in colour and form. Found on siliceous rock, sometimes base-rich. Thallus irregular, broken into areoles which contain up to seven apothecia
References:
Wirth, V. et al. (2013) Die Flechten Deutchlands, Band 2
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species