Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Unikonta |
| system | Opisthokonta Cavalier-Smith, 1987 |
| kingdom | Fungi Whittaker - fungi |
| divisio | Ascomycota Caval.-Sm. - sac fungi |
| subphylum | Pezizomycotina O.E. Erikss. & Winka |
| class | Arthoniomycetes O.E. Erikss. & Winka |
| subclass | Arthoniomycetidae |
| order | Arthoniales Henssen ex D. Hawksw. & O.E. Erikss. |
| family | Arthoniaceae Reichenb. ex Reichenb. |
| genus | Arthonia Ach. - dot lichen |
| species | Arthonia diffusa Nyl. - Diffuse Dot Lichen |