Foliose lichen on hawthorn twig. Greenish, shiny lobes. Some white specks on older ridges. Pinhead 3mm dia.
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.
I also think it might be M. subaurifera. (Also might be Parmelia sulcata below the pinhead and a small patch of a Physcia about 8 o'clock from the pinhead.)
Yes, plenty of variety on this twig - 8 or 10 lichens and counting! It's only 30cm long * 1cm dia. Watch this space!
Lat/Lng: 55.4737, -3.2009
OS grid ref: NT241206