Lecanora campestris  forme des surfaces horizontales en ciment

    This ecoform preferentially grows on very nutrient-rich substrata in urban areas and differs from the Lecanora campestris type by its main habitat: horizontal surfaces, cement grounds, pavement areas, stairs, window sills, wall tops, etc. Thallus effuse, often covered with soil debris and dust, and above all with algae, brownish, greenish, ochraceous, etc. Apothecia are less numerous. Discs soon dark brown to brown-black, blackish.*