White lichen on Limestone

White lichen on Limestone

Observation - White lichen on Limestone - UK and Ireland. Description: White outer thallus, placodioid in parts along outside edge. Inner thallus white and grey and black. Centre of thallus missing. Growing on limestone. Soredia in middle of thallus. Possibly Caloplaca teicholyta.

White outer thallus, placodioid in parts along outside edge. Inner thallus white and grey and black. Centre of thallus missing. Growing on limestone. Soredia in middle of thallus. Possibly Caloplaca teicholyta.