Rhizoplaca chrysoleuca (rock-posy lichen, rockbright) is a pale yellowish-green to gray-green umbillicate foiliose lichen . It was first described in 1791 by English botanist Sir James Edward Smith as Lichen chrysoleucus; Friedrich Wilhelm Zopf transferred it to the genus Rhizoplaca in 1905. Lichen spot tests are K+ yellow or K-, KC+ yellow-orange, C-, and P- on the cortex, and K-, KC+ red or KC-, C-, and P+ yellow or P- on the medulla.