Crustose lichen, yellow-green areas separated by black margins. Lots of patches on the hillside growing on quartzite. Possibly Rhizocarpon geographicum.
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.
Lat/Lng: 52.5765, -2.9385
OS grid ref: SO364980