Xanthocarpia diffusa

Xanthocarpia diffusa is a species of saxicolous (rock-dwelling) crustose lichen in the family Teloschistaceae. First described in 2011 from coastal rocks in Georgia, it is characterised by its yellow to greyish thallus with distinctive diffuse margins often bordered by a pale prothallus. The species primarily occurs along coastal areas of the Black Sea region, with some isolated populations in the Mediterranean region, where it grows on damp siliceous rocks, particularly around seepage zones and in areas exposed to sea spray. Though initially described in the genus Caloplaca, molecular phylogenetics studies led to its transfer to Xanthocarpia in 2013....read more on Wikipedia.