Xyleborus (lichen)

Xyleborus is a small genus of lichen-forming fungi in the family Stereocaulaceae. It comprises two species. The genus was circumscribed in 2009 by Richard C. Harris and Douglas Ladd with Xyleborus sporodochifer assigned as the type species. A second species, X. nigricans, was added to the genus in 2015. This genus is only found in North America, in the Ozarks, the Appalachians, and the Mid-Atlantic Coastal Plain. Xyleborus species only grow as a crust with black apothecia on weathered logs and stumps in intact forests.