Lichen ( Xanthoria ? parietina )

The first "walk to the bins" blip of the new season.  Being fair it was mainly rubbish we had accumulated while doing jobs at the Lodge.  I thought I would be taking a "signs of spring" blip.  However the day was sunny and bright and the lichens of the Hawthorn stood out in contrast to the twig.

MY identification is as always with Lichens tentative.  I am quite happy to be corrected but I am basing the identification on the width of the lobes that suggest (to me at least) X parietina as opposed to X polycarpa.