Arthonia polymorpha
- kingdom: Fungi
- phylum: Ascomycota
- class: Arthoniomycetes
- order: Arthoniales
- family: Arthoniaceae
- genus: Arthonia
- species: Arthonia polymorpha
Jacksonville- Sanford
Florida- Gueydan
- Mandeville
Louisiana- La Feria
Texas- Brattleboro
Vermont
United States