Caloplaca flavovirescens. A relatively common lichen especially to be found on artificial calcareous substrtaes. It differs from similar species in having a non lobate margin which is paler than the apothecia. This photograph was taken on wall close tot he reservoir below Meall nam Tarmachan in Perthshire.
Species category:
Photo:
![](https://psl.brc.ac.uk/sites/default/files/upload/Caloplaca%20flavovirescens.jpg)