Lecanora subcarnea (Lijl.) Ach.

    Thallus crustose, minutely cracked to areolate, areoles determinate, flat but unequal in height, margin crenulate, surface granulose to verrucose, whitish, pale greyish, sometimes (although seldom) tinged ochraceous, prothallus well-developed, fibrous, withish. Apothecia numerous, 0.5-1.5 mm diam., innate becoming sessile, constricted below, disc convex to globose but sometimes becoming flat when old, pale pink, pink-brownish hardly visible due to dense white pruine, exciple slightly paler or darker than the thallus, excluded when old. Ascospores colourless, simple, ellipsoid, 10-14 x 6-8 µm according to the literature, 13-17 x 6-8 µm according to our measurements. Thallus C-, K+/- dirty yellow, Pd+ yellow-orange > red-orange. One of the few species growing on almost neutral to calcareous sheltered rocks in our prospection area, sometimes on walls. N.B. Not especially maritime, easily mistaken with Lecanora ochroidea which is a very similar, but maritime, species growing on siliceous rocks. The latter has an ochraceous thallus, K+ yellow > red. When both species grow on the same substratum, identification in the field requires the K reaction. Inland, not to be confused with Lecanora swartzii which is Pd- and C+ orange. Near the seashore, not to be confused with Lecanora praepostera which is K+ yellow > red, but its apothecia are black and not pruinose.