Lichen growing on a crab apple tree
No identification made yet.
No interactions present.
There are several lichen species in the photo, from the left;
Physcia (probably P. tenella)
Lecanora chlarotera (brown apothecia)
Lecidella elaeochroma (black apothecia)
Xanthoria parietina (yellow foliose)
The Natural History Museum has a useful online identification key here that you could try:
Lat/Lng: 53.6, -2.9
OS grid ref: SD4415