Myriolecis bandolensis (B. de Lesd.) Cl. Roux & Nimis
in Nimis, The Lichens of Italy. A Second Annotated Catalogue: 19, 2016. Basionym: Lecanora bandolensis B. de Lesd. - Bull. Soc. Bot. France, 101: 223, 1954.
Synonyms: Lecanora albescens var. bandolensis (B. de Lesd.) Clauzade & Cl. Roux
Distribution: C - Tosc (TSB 35190), Camp (Garofalo & al. 2010). Sar. S - Si.
Description: Thallus crustose, episubstratic, pure white, rimose-areolate, 0.2-0.5 mm thick, forming 0.5-2 cm wide patches, rarely incompletely delimited by a dark prothallus Areoles 0,2-1,5 mm wide, more or less angular, the peripheral ones often larger and indistinctly radiating. Cortex 20-110 thick, filled with large crystals soluble in N; medulla white, I-, filled with crystals. Apothecia lecanorine, 0.2-0.5(-0.8) mm across, at first immersed, then subsessile, with a pale brown to black, flat disc, and a thin, non- or only slightly raised thalline margin. Thalline exciple thick, corticate, the outer part often blue-green and N+ reddish brown, the inner part filled with small crystals; epithecium pale brown to greenish brown, the greenish parts N+ reddish brown, with small, yellowish brown crystals insoluble both in K and in N, and larger crystals solubles in N; hyménium colourless, 50-65 μm high, inspersed with small crystals in upper part, I+ blue; paraphyses coherent, simple or sparingly branched, 1.5-2 μm thick at base; 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,11-15 x 5-7 μm. Pycnidia dark, immersed. Conidia sickle-shaped, 14-20 x c. 1 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus with low amounts of 2.7-dichlorolichexanthone.
Note: a mostly coastal, probably Mediterranean-Atlantic lichen of calcareous or basic siliceous rocks; related to M. albescens, but a different species (see Bertrand & al. 2010).