Rhizocarpon reductum
- kingdom: Fungi
- phylum: Ascomycota
- class: Lecanoromycetes
- order: Lecanorales
- family: Rhizocarpaceae
- genus: Rhizocarpon
- species: Rhizocarpon reductum
Queanbeyan
New South Wales
Australia
Lookout Mountain
Georgia
Bar Harbor
Camden
Maine
Brewster
Massachusetts
Ironton
Missouri
Ringwood
New Jersey
Dover Plains
New York
Birchwood Lakes
Mountainhome
Stewartstown
Towamensing Trails
Pennsylvania
Lookout Mountain
Tennessee
United States
Särö