Aspicilia cyanescens

Aspicilia cyanescens (bluish sunken disk lichen) is a rough surfaced, bluish-tinged pale gray rimose to areolate crustose lichen, endemic to California.: 226  It mostly grows on rock.: 226  It is unique among California members of its genus in that it can sometimes be found on growing on bark or wood, especially incense cedar and sometimes on white fir or giant sequoias in the central Sierra Nevada range and southern California mountains.: 226  It has a black or bluish or greenish prothallus.: 226  The prothallus is usually absent when growing on rock.: 226  Each areole commonly has 1–7 roundish to angular apothecia that are 0.1–1.3 mm in diameter. Apothecia have black to blue-black, concave to flat discs, without pruina. Lichen spot tests are all negative.: 226 ...read more on Wikipedia.