Clauzadea monticola (Schaer.) Hafellner & Bellem.

   Thallus crustose, thin, almost smooth to minutely rimose or areolate, grey, whitish, pale grey-brownish to pale ochre, prothallus absent. Apothecia usually numerous, sessile, flat to rapidly convex, or even irregularly subglobose, 0,3-1 mm diam., not pruinose, dark red-brown when wet, brown to dark brown or black when dry, true exciple concolourous or darker finally excluded. Asci 8-spored. Ascospores simple, ellipsoid, colourless, 6-12 x 4-8 µm. Photobiont : Trebouxia. Chemical spot tests negative. Not common in our prospection area, on calcareous rocks, more common old walls mortar, very seldom on cement or concrete. See Sarcogyne regularis, Sarcogyne privigna and Sarcogyne clavus that display highly numerous small ascospores in each ascus and  Lecidella stigmatea with apothecia less globose, more flat with a thick conspicuous margin.*