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 |
| Ascomycota incertae sedis | |
| genus | Abrothallus De Not. - abrothallus lichen |
| species | Abrothallus caerulescens Kotte |