Pertusaria coronata (Ach.) Th. Fr.

       Thallus thin, somewhat grainy, fissured grayish, yellowish-gray, sometimes with greenish areas (in wet weather), covered with cylindrical to somewhat globose isidia (but without a globose and darker apex), brittle and often broken and then leaving a punctiform scar at their top. Very rarely fertile species, otherwise apothecia completely immersed and opening by a black point, by 1-4 at the top of a fertile wart. Spores simple, hyaline, elliptical, 90-160 x 45-70 µm. Thallus: C-, K+ yellow to orange becoming dirty orange-brown, KC+ yellowish, P+ yellow-orange, UV+ orange. Rare, highly variable species occuring on the bark of the trunks of old alignment or isolated trees, rarely on wood or rocks.

N.B. Species variously interpreted by the authors, very similar to Pertusaria coccodes from which it differs mainly by its chemical reactions.