in Nimis, The Lichens of Italy. A Second Annotated Catalogue: 19, 2016. Basionym: Lecanora liguriensis B. de Lesd. - Bull. Soc. Bot. France, 96, 7-9: 175, 1949.
Distribution: N - Lig. C - Tosc (Ravera & al. 2022).
Description: Thallus crustose, episubstratic, rimose-areolate, white to cream-coloured, forming well-delimited, small patches. Apothecia lecanorine, usually crowded, at first immersed, later subsessile, with a slightly concave to slightly convex, pale brown disc, and a persistent, smooth, slightly raised thalline margin. Thalline exciple without crystals; epithecium pale yellowish brown, richly inspersed with small crystals soluble in K; hymenium colourless in lower part, very pale brown in upper part, inspersed with small crystals; paraphyses encrusted with small crystals soluble in K along the whole length, with a gelatinous sheath, the apical cells 2-4 μm wide; hypothecium colourless. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid, 8-12 x 4.8-5.5 µm. Photobiont chlorococcoid. Spot tests; thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a rather poorly known species found on siliceous rocks in the adlittoral belt, also reported from the Mediterranean coasts of France. It differs from M. salina in the absence of gyrophoric acid and in the smaller apothecia devoid of crystals, and is related to M. albescens (see Roux & coll. 2014).