Arthothelium macrothecum
- kingdom: Fungi
- phylum: Ascomycota
- class: Arthoniomycetes
- order: Arthoniales
- family: Arthoniaceae
- genus: Arthothelium
- species: Arthothelium macrothecum
Oranjestad
Sint Eustatius
BQ
Jacksonville Beach- Neptune Beach
Florida
United States