Found these Crustose, foliose and fruticose lichens growing happily on a 12 year old Mountain Ash tree.
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: 53.4226275461, -6.240234375
OS grid ref: SB183001
South East Ireland. Rural Setting.