Unidentified foliose lichen on tree

Unidentified foliose lichen on tree

Observation - Unidentified foliose lichen on tree - UK and Ireland. Description: I am having major problems identifying this lichen. I'm not even sure this isn't two species together. This was found on a cherry tree in a suburban garden. The whole tree was covered in small clumps of it.

I am having major problems identifying this lichen. I'm not even sure this isn't two species together. This was found on a cherry tree in a suburban garden. The whole tree was covered in small clumps of it.