Two lichen species on lime trunks. Widespread distribution.
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.
It looks like there's a third greenish crustose species there as well.
Hi Bill, you're close with your initial ID of X. polycarpa for the yellowish-grey one but not quite right .....
Give the key below a try, you only need to click the details you're sure of and then click Search at the bottom of the page:
Lat/Lng: 52.3, -0.1
OS grid ref: TL3071