Grey crustose lichen
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.
The comment I made to that observation equally applies here. Evidently more than one crustose lich here, but poorly developed, as is usual in graveyards around Glasgow.
Lat/Lng: 55.8619, -4.232
OS grid ref: NS604654