Teloschistaceae Xanthocarpia marmorata (Caloplaca marmorata) (Caloplaca lactea) Growth type crustose Chemical results: Thallus K-, apothecia K+ red Pioneer species on limestone, soft chalk and sea shells Inconspicuous or thin white thallus. The small, dispersed, bright orange-yellow apothecia have prominent margins and become translucent when wet. Spores 11-14 x 6-8.5, septum narrow, less than 1/8 length.

Xanthocarpia marmorata (Caloplaca marmorata)
Canford Cliffs, Dorset. January 2013