Grey lichen on silver birch tree in south-eastern facing garden.
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.
Your identification looks fine to me. Do I see some green lichen in there as well?
Lat/Lng: 56.1, -3.2
OS grid ref: NT2791