Leotiomyceta represents all the filamentous ascomycete fungi (Pezizomycotina), excluding the classes Pezizomycetes and Orbiliomycetes. It is well supported in several studies comparing DNA sequences in fungi.[1][2] It has originally been proposed as a superclass[3] but later was proposed as a rankless taxon for any well supported group above class (together with Saccharomyceta, Dothideomyceta, and Sordariomyceta[4]). Rankless taxa do not strictly follow the rules for taxonomic classifications in plants and fungi (ICBN) and therefore these names are informal, although they appear to reflect natural groups.
| Leotiomyceta | |
|---|---|
 | |
| Leotia viscosa found in West Lebanon, New Hampshire | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| (unranked): | Saccharomyceta |
| Subdivision: | Pezizomycotina |
| (unranked): | Leotiomyceta O.E. Erikss. & Winka 1997 |
| Unranked taxa and classes | |