Order: Lecanorales       Family: Lecanoraceae Species: Lecanora campestris Growth type crustose. Photos: On stone walls and concrete post. Co. Cork, SW Ireland. Greyish-white, warted or areolate thallus usually with fimbriate white prothallus. Large chestnut to dark-brownish apothecia are crowded in centre of thallus. Smooth margins, contorted with age. Asci 8-spored, the spores simple, 10-14(-17) x 6-8.5(-9) µm. Microscope photograph below. K+ yellow, C-, P- or P+ very pale yellow, UV- or UV+ dull orange Frequent on basic to calcareous stone and walls, also found on nutrient-enriched acidic rocks and wood. Similar: Lecanora horiza, thallus K+/- pale yellow

Microscope photograph

Lecanora campestris 2009 and April 2012