Acarospora veronensis A. Massal.
Thallus formed by large protruding squamules, lined by a rounded margin, 0.5-2 mm in size, most often separated from each other and forming a line, giving them in aerial view the appearence of a "string of volcanic islands", brown-olive more or less pale, light brown when moist, dark-brown, chestnut-brown, chocolate when dry. Apothecia of 0.2-0.5 mm diam., one (2-3) per squame, positioned at the top of the squame, giving the appearence of a small volcano with its crater, concave disc, brown-red, dark brown-red, slightly visible margin, or lacking. Ascospores 200-300 per ascus, elliptic, colourless, 4-5 x 1.5-2 µm according to literature, 4-5 (6) x 1.5-2 µm according to our measurements. Photobiont : green algae. Thallus : C-, K-, KC-, P-. Species not specifically maritime, growing on horizontal rocks, if not too acid. Cf. Acarospora subrufula, more reddish, K+ red and strictly maritime.*