in Zhao Xin & al., Fungal Divers., 78: 301, 2016. Basionym: Lecanora invadens H. Magn. - Lich. Central Asia: 87, 1940.
Synonyms: Lecanora meolansii B. de Lesd.; Myriolecis invadens (H. Magn.) Sliwa, Zhao Xin & Lumbsch
Distribution: N - Ven (TSB 19712).
Description: Thallus crustose, endosubstratic or thinly episubstratic and poorly evident, often developed only around the apothecia, pale grey to greenish grey, often with a bluish hue. Apothecia lecanorine, sessile and often constricted at base, 0.3-0.8(-1) mm across, with a flat to convex, dark brown to patchily bluish black, epruinose or slightly pruinose disc, and an entire, smooth to slightly crenulate, pruinose, white to grey thalline margin. Thalline exciple corticate, the cortex bluish in outer and upper parts, filled with granules (visible under polarized light) which are insoluble in K, and soluble in N, the medulla rich in algae; proper exciple prosoplectenchymatous, 10-15 μm wide; epithecium yellowish brown to olive green, often at least partly blue-green, the blue-green parts N+ purple, with sparse coarse granules between paraphyses tips, which are soluble in K and insoluble in N, and an epipsamma of small granules which are insoluble in K, but soluble in N; hymenium colourless, 45–65 μm high; paraphyses simple or sparingly branched, not markedly expanded at tips; hypothecium colourless or pale yellow, 50-100 μm high. 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, 9-12 x 6-7.5 μm. Photobiont chlorococcoid. Spot tests: apothecial margin K- or K+ pale yellow, C- or C+ yellow, KC+ yellow, P-. Chemistry: vinetorin (5-chloro-3-O-methylnorlichexanthone), sometimes present only in traces.
Note: on calciferous rocks in upland areas, often starting the life-cycle on other crustose lichens; certainly more widespread throughout the country. The species is closely related to M. semipallida.