(Hypogymnia tubulosa)

(Hypogymnia tubulosa)

Observation - (Hypogymnia tubulosa) - UK and Ireland. Description: A foliose lichen with what appear to be perithecia, growing on Hawthorn. Can anyone help with an ID, please? Edit: changed to match J Scott's ID. Many thanks.

A foliose lichen with what appear to be perithecia, growing on Hawthorn. Can anyone help with an ID, please?
Edit: changed to match J Scott's ID. Many thanks.