Caloplaca ruderum. Another species with a distinctly eastern distribution in the UK. It is usually to be found on articicial habitats, and is characteristed by the separated fruits on a scattered, pruinose, usually pale thallus which is variable in the amount of the areolae. This photograph was taken on the wall that surrounds Ashington Church in West Sussex.
Species category:
Photo:
![](https://psl.brc.ac.uk/sites/default/files/upload/Caloplaca%20ruderum.jpg)