Caloplaca xantholyta. This species, along with Caloplaca chrysodeta has never been found fertile. Originally, it was placed in Lepraria, then Leproplaca, but now it is included under Caloplaca. It is wholely sorediate, but sometimes has rather definite seeming marginal lobes, but these are never corticate. It is not uncommon on calcareous substrates, especially churchyards. This photograph was taken on roadside rocks in Waterworks Valley, Jersey.