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.
Like Nigel I have never seen this and my agreement is not with 100% confidence, but my reasoning is the same as his.
Lat/Lng: 56.5362, -6.3369
OS grid ref: NM334466
On large boulder at top of sea-cliff near Treshnish Point, Isle of Mull