Shiny, dark grey, cracked, crustose lichen growing on coastal, cliff-top, siliceous rocks. Dark almost black prothallus. Lecanorine apothecia with black discs. Possibly Rinodina luridescens.
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: 51.7368, -5.2488
OS grid ref: SM757092