Order: Lecanorales       Family: Lecanoraceae Species: Lecanora chlarotera Rim Lichen Growth type crustose. Photos: On twig and trunks of deciduous trees. Cork, SW Ireland. Very variable. Smooth or warted creamy-grey or grey thallus, sometimes areolate, prothallus absent. Numerous buff to reddish-brown apothecia with thick, slightly crenulate or smooth margins. Epithecium overlaid with coarse granules. 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- Similar: L. argentata. P+ weak yellow, UV-. Black prothallus usually present, discs often piedbald. Epithecium without granules. L. sinuosa. Apothecia margin contorted, over-arching disc.

Lecanora chlarotera Macroom, Co.Cork. December 2008