Lecanora varia (Hoffm.) Ach.
Thallus crustose, variable, usually oval-shaped, 1-3 cm across, granulose, margin paler, thin and indeterminate, made of rounded granules, minute and scattered on dry substrata and well developed, forming a thick crust on moist and shaded substrata, slightly areolate, pale yellowish, yellow-ochraceous, yellow-greenish. Apothecia usually abundant, sometimes in dense clusters, cup-shaped when young becoming sessile, 0.4-1 mm diam., disc flat, pale yellow, pale brown-pink, pale ochre-greenish, pale apricot, pale olivaceous, pale brownish (the simultaneous presence of these different colours on the same thallus is a specific trait), exciple wavy, sometimes skewed by compression, thick, crenulate or verrucose, whitish. Ascospores simple, ellipsoid, 9-12 x 5-7 µm. Photobiont: Trebouxia. C-, K- or pale yellow, Pd+ yellow, UV+ orange. Locally common, on worked timber, poles, fences, etc. N.B. This species is often the target of parasitic species, visible when host apothecia turn blackish. The only parasite rather easy to identify is Ramboldia insidiosa when its apothecia are present, but it is not the most common. Not to be confused with Lecanora conizaeoides that is rare on timber except in polluted areas and more yellow-greenish, Pd+ red. Near the seashore, not to be confused with Lecanora confusa which is C+ pale orange and with Lecanora saligna of which apothecia are browner. Lecanora symmicta grows in the same habitat but exciple is excluded in the mature apothecia.*