Picture taken on 1st March 2008 at Villa Joana, Vallvidrera, Barcelona, Catalonia, on constructive material, 100 m. altitude.
Lichen similar to Lecanora rupicola but in Lecanora schwartzii apothecia are more prominent than in Lecanora rupicola where they are more or less immersed. In both cases disc with pruina, rim crenulated in certain apothecia. The size of the apothecia is smaller in the case of L.swartzii (0,3-1 mm) compared to L. rupicola (1-2 mm).