Order: Lecanorales       Family: Lecanoraceae Species: Lecanora chlarotera sens str. Growth type crustose. Photos: On deciduous trees. Cork, SW Ireland. Very variable. Smooth or warted creamy-grey or grey thallus, prothallus absent. Numerous buff to red-brown apothecia with thick, slightly crenulate or smooth margins. Epithecium overlaid with coarse crystalline granules, large crystals present in apothecia margins. Spores simple, 10-15 x 6-8 µm. Micro photos below. Vouauxiella lichenicola can occur on the discs. Common on trees, wooden fences and posts in unpolluted habitats. Thallus K+ yellow, C-, P-, UV+ dull orange. Apothecia margins P- Often confused with Lecanora hybocarpa (left in image below) Similar: Lecanora argentata is P+ weak yellow, UV- and Lecanora sinuosa has apothecia margins contorted and over-arching discs

Microscope photographs





Lecanora chlarotera