Phlyctis argena

Phlyctis argena

Observation - Phlyctis argena. Description: Leprose lichen near the base of a mature sycamore tree. Any suggestions for ID, please? Edit: Title changed to match Alan's ID - many thanks.

Leprose lichen near the base of a mature sycamore tree. Any suggestions for ID, please?

Edit: Title changed to match Alan's ID - many thanks.