Three new dark-fruited Caloplaca species.
Three species of Caloplaca are described as new to science: Caloplaca caesiosorediata Arup & van den Boom, a corticolous species and two saxicolous species, Caloplaca catillarioides Arup & van den Boom, and C. caesioisidiata Arup & van den Boom, all from the archipelago of Cape Verde. They are dark-fruited and have a pale to dark greyish crustose thallus. None of the new species are ph