Lecanora muralis (Stonewall Rim-Lichen)

Both photos (above & below) were taken at UW-Arboretum, Madison
Both photos (above & below) were taken in Madison
Both photos (above & below) were taken in Madison
Both photos (above & below) were taken at UW-Arboretum, Madison
Both photos (above & below) were taken at UW-Arboretum, Madison
Both photos (above & below) were taken at UW-Arboretum, Madison