Arthonia convexella Nyl.


CC BY-NC 3.0 - United States National Herbarium - Smithsonian (US:Lichens) - Source: https:// lichenportal.org/portal/taxa/index.php?taxon=130827
Leg. J. W. Thomson Nr: 19181 1977-05-08, USA, Wisconsin, Marathon, E of Wausau.