Lecidella stigmatea

A crustose lichen with a pale grey, green or brown thallus that often forms circular patches. The sessile apothecia have very dark brown or black discs with glossy margins that become excluded.

Thallus: C-, K+- yellow, UV-

Lecidella stigmatea is found throughout Scotland on more or less calcareous rocks, cement and mortar, including kerbstones. BLS distribution map