Green Lichen?

Green Lichen?

Observation - Green Lichen? - UK and Ireland. Description: Green Lichen? Or Algae? I think this is Lichen, there were also some grey Foliose Lichen in with it. On a wall facing SE.

Green Lichen? Or Algae? I think this is Lichen, there were also some grey Foliose Lichen in with it. On a wall facing SE.