Thallus a bright green to brownish crust, cracked and minutely but conspicuously covered by rounded warts, often with green soredia, which may dominate the thallus surface; apothecia brownish black, about 1mm diameter, flat with a thin 'proper' margin, more convex when damp.

This species needs chemical testing with both C and K. Both tests should be negative if it is lightfootii'.

Widespread on twigs and bark, more common in damp woodland.

All year round.

Widespread, particularly in the west of Britain.

Status in Leicestershire and Rutland not known.