Purplish crustose lichen

Purplish crustose lichen

Observation - Purplish crustose lichen. Description: Purplish crustose lichen growing on coarse, siliceous sandstone (Millstone Grit) block in stone wall. Areolate thallus with black immersed apothecia. Possibly Rhizocarpon richardii.

Purplish crustose lichen growing on coarse, siliceous sandstone (Millstone Grit) block in stone wall. Areolate thallus with black immersed apothecia. Possibly Rhizocarpon richardii.