Identification key
Powdery crustose lichens
(1) Lecanora sp.
Many lichens present a powdery-looking thallus, usually without apothecia, and gray, green, or bluish color. These species are usually found in bark crevices, where they can sometimes cover large areas. It can be either a crustose thallus covered with soralia, or a leprous thallus composed exclusively of small granules. Determining these lichens requires the use of chemical reagents, microscopic examination, as well as molecular analysis.
Risk of confusion
Species of the genus Candelariella also have a powdery thallus, but are yellow-orange in color.