Sycamore tree - different tree from previous posting. Don't know what the little red spots are; they appear to be separate from the parmelia.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
The little pinkish-red spots on the Physcia could be a lichenicolous fungus (parasitic on lichens).
Thanks for this information. I'd never heard of lichenicolous fungi but have just looked online for some images and found some similar ones.
Lat/Lng: 50.606, -2.465
OS grid ref: SY671785
On one of a group of mature sycamores on the edge of a sportsfield