Pyrenula xanthoglobulifera

Pyrenula xanthoglobulifera is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. First described in 2013 from specimens collected in Chapada do Araripe, Brazil, it is characterized by its pale yellowish-brown thallus with white pseudocyphellae, spherical fruiting bodies immersed in thalline warts, and large brown muriform ascospores visible even under a stereo microscope. The species is distinguished by the presence of lichexanthone, which causes the thallus to fluoresce yellow under ultraviolet light. It primarily grows on smooth tree bark in Caatinga forest environments in northeastern Brazil, and has also been recorded in Guadeloupe and the Pantanal wetland region of west-central Brazil....read more on Wikipedia.