Synonyms: Aspicilia calcarea var. coronata (A. Massal.) Körb.; Aspicilia coronata (A. Massal.) B. de Lesd.; Aspicilia coronata var. petkae (Servít) Szatala?; Aspicilia laurensii B. de Lesd.; Lecanora coronata (A. Massal.) Jatta; Lecanora coronuligera Zahlbr.; Lecanora laurensii (B. de Lesd.) Croz.
Distribution: N - Ven (Caniglia & al. 1993, Lazzarin 2000b). C - Tosc, Marc (Nimis & Tretiach 1999), Umb (Nimis & Tretiach 1999, Panfili 2000, Ravera & al. 2006), Laz (Nimis & Tretiach 2004), Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008, Genovesi & Ravera 2014), Sar. S - Camp (Garofalo & al. 1999, 2010, Aprile & al. 2003b, Nimis & Tretiach 2004), Pugl (Nimis & Tretiach 1999), Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Nimis & al. 1996b).
Description: Thallus crustose, endosubstratic or thinly episubstratic, continuous to finely rimose around the apothecia, grey-white to pale yellowish green, dull, N+ green. Apothecia lecanorine-aspicilioid, 0.2-0.5 mm across, usually immersed in pits of the rock, round to strongly irregular in outline, with a black, but usually densely white-pruinose, concave to flat disc and a slightly raised, white thalline margin. Epithecium olive green to olive-brown, with crystals, N+ emerald green, K+ brownish; hymenium colourless, I+ blue or sometimes partly turning yellow-green; paraphyses in lower part 1.5-2 µm thick, slightly branched and anastomosing, in upper part submoniliform, with the uppermost cells subglobose, to 6 µm wide; hypothecium colourless. Asci (2-)4(-6)-spored, cylindrical-clavate. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 18-34 x 13-28 µm. Pycnidia rare, immersed, with a black, punctiform ostiole. Conidia filiform, straight or slightly curved, 6-11 µm long. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: aspicilin.
Note: related to C. contorta, but with an endolithic to hemiendolithic thallus, this is a mainly southern lichen in Europe, most common on hard dolomite. In Italy it is most frequent in upland areas, especially in the South. According to Nordin (in litt.) the taxon is heterogeneous and more species might be involved, so that I refrain from a formal recombination.