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.
Synangium is quite right. I intended R. farinacea, but brain sent out the wrong message. R. subfarinacea is a species of (usually) coastal rocks, with the soralia not so neatly discoid.
Thanks for spotting this, Nigel.
Lat/Lng: 50.8464, 0.183094
OS grid ref: TQ537074