Order: Teloschistales       Family: Teloschistaceae Species: Xanthoria calcicola Growth type foliose. Photos: On sea wall, Co. Waterford and fertile specimen from the Burren, Co. Clare, Ireland. Similar to X. parietina but more orange in colour. The centre of the thallus is densely isidiate and lobe ends are wider. Coarse, crowded isidia are knobbly and convex, sometimes becoming flattened and lobule-like. Apothecia infrequent, discs with roughened margins. Scattered distribution throughout Ireland on calcareous substrates, concrete walls, posts and cement tiles. K+ crimson / purple.

Xanthoria calcicola. Co. Waterford and Co. Clare. May and July 2009