Order: Teloschistales Family: Teloschistaceae
Species: Xanthoria elegans
Photos: On concrete. Bandon, Co. Cork, SW Ireland.
Closely adpressed thallus forming dark orange to orange-red rosettes. Uniformly narrow, radiating, convex lobes, 0.5-1.0mm wide, attached to the substrate by hapters. Abundant apothecia in centre of thallus, margins +/- crenulate. Thallus K+ crimson.
Occurs on nutrient-rich rocks in upland areas, also found on concrete, slate and asbestos-cement in lowland and urban areas. Scattered distribution in Ireland, mainly eastern half of country.
Similar: Caloplaca saxicola has shorter, white-pruinose lobes and apothecia extending to thallus edge.
Xanthoria elegans May 2010