Lichen?

Lichen?

Observation - Lichen?. Description: Thought I would do the Opal Air survey, but even after reading and looking at all the pictures on the website I am not sure what I'm looking at! Help please! On a low stone wall, facing south, in partial shade.

Thought I would do the Opal Air survey, but even after reading and looking at all the pictures on the website I am not sure what I'm looking at! Help please!

On a low stone wall, facing south, in partial shade.