Lecanora dispersa (Pers.) Sommerf.
Lichen dispersus Pers., Annln Bot. 1: 27 (1794).
Thallus white to grey or blackish, not readily seen, often absent. Apothecia small, scattered, 0.05-0.2 mm diam., disc yellow-brown to dark brown, epruinose or white-pruinose, margins persistent, entire or crenulate, glossy brown, esorediate, eroding, becoming white-sorediate. Ascospores biseriate, broadly ellipsoid 8.3-10.2 × 5.1-6.8 µm.
N: S: Throughout, in urban environments on concrete and mortar, also on basic rocks (limestone) and coastal rocks.
Cosmopolitan
