Lecanora campestris forma alba
Lecanora campestris var. alba B. de Lesd.
This ecoform is characterized by its white thallus and is restricted to calcareous rocks. Scarce in our prospection area and the localzed to ancient calcareous quarries used to supply limetone furnace. N.B. There are many intermediate forms with Lecanora campestris in relation to the substratum properties.*