Caloplaca durietzii, or Durietz's orange lichen, a smooth surfaced yellowish orange crustose areolate lichen with elongated lobes that grows on wood or bark in southwestern North America.

It is commonly seen growing on old junipers in Joshua Tree National Monument in the Mojave Desert.

It is verrucose (grows like a warty crust) or areolate (broken up on the surface into "areoles" that look like the polygonal mud "islands" in a dry lakebed), with small convex areolas or verrucae (warts), and is without a prothallus (the body part under the areola "islands" that connects them).

Apothecia (the fruiting part of the fungus) have discs that are darker orange than the main body (thallus).

[1] It is similar to Caloplaca microphyllina, but C. durietzii does not have soredia (small bundles of algae wrapped in fungal filaments that are dispersed by wind for asexual or vegetative reproduction).