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, pale yellowish, white-ochraceous, yellow-ochraceous, grey-yellowish in dry weather, grey-yellow-greenish in moist weather. Apothecia usually abundant, sometimes in dense clusters, cup-shaped when young becoming sessile, 0.4-1 mm diam., disc flat, pale yellowish, pale pinkish-brown, yellowish-brown, pale apricot, pale olive-coloured, pale brownish, greyish, margin persistent, sinuous and sometimes deformed on contact, thick, crenate or warty, whitish or paler (N.B. 1 This margin seems formed of two layers: a dull interior and a shiny exterior; N.B. 2 Sometimes there are very large and very sessile apothecia with sinuous margins, in the middle of the apothecia of normal size and also "secondary" apothecia coming into its apothecia). Asci 50-60 x 22-25 µm according to our measurements. Spores simple, elliptical, 9-12 x 5-7 µm according to the literature; 11-14 x 8-9 µm according to our measurements. Photobiont: Trebouxia. C-, K+ pale yellow or yellow, Pd+ yellow, UV+ orange. Locally common, on worked timber, poles, fences, etc, also on dead wood..
N.B. Not to be confused with Lecanora conizaeoides that is rare on timber except in polluted areas, sorediate 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.