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Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Are you referring to the mass of foliose thalli which fill the picture? Is the red apothecia of a different species, or part of the Parmelia sulcata?
I have added agreement to Cladonia sp., as the presumed subject of the photograph. Clearly one of the red-fruited species, but even if we had a good view of it, identifying a montane, red-fruited Cladonia from a photograph would often be unwise. As well as the lowland species, true C. coccifera, C. borealis and others would have to be given greater than usual consideration.
I agree the foliose lichen is a Parmelia, but the definition of the photograph again makes it difficult or impossible to state which. On balance I would say P. saxatilis rather than P. sulcata.
Lat/Lng: 56.391, -3.9375
OS grid ref: NN804237
In Ben Lawes NNR above fenced area near car park. About 450-500m above sea level