Acarospora veronensis A. Massal.Thallus crustose, episubstratic, areolate. Areoles 0.2-1.2 mm in diam., dispersed or gathered in small clusters, round to slightly angular, flat to slightly convex, usually smooth, chestnut brown to almost black, generally epruinose, with a usually darker margin and lower surface. Cortex paraplectenchymatous, 15-25 µm thick; algal layer continuous. Apothecia 0.1-0.6 mm across, persistently immersed, usually slightly crateriform, 1-5 per squamule, with a concave, reddish brown to almost black, smooth or rarely umbonate disc, and an indistinct to very slightly raised thalline margin. Proper exciple thin, 10-15(-20) µm wide; epithecium pale brown; hymenium colourless, 60-90(-110) μm high, the hymenial gel hemiamyloid, K/I+ light blue fading to light red; paraphyses 1.3-2 µm thick at base, 3-4 µm at apex; hypothecium colourless or pale straw. Asci 100-200-spored, cylindrical-clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, subcylindrical, 3-5 x 1-2 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.