Unidentified thing - fungus?

Unidentified thing - fungus?

Observation - Unidentified thing - fungus? - UK and Ireland. Description: Odd organic-looking growth found on the side of a rock in a shady part of a park. Looks like it might be some sort of fungus?

Odd organic-looking growth found on the side of a rock in a shady part of a park. Looks like it might be some sort of fungus?