| Tremellomycetes | |
|---|---|
|  | |
| Tremella mesenterica | |
| Scientific classification   | |
| Kingdom: | Fungi | 
| Division: | Basidiomycota | 
| Subdivision: | Agaricomycotina | 
| Class: | Tremellomycetes Hibbett, Matheny & Manfr. Binder (2007) | 
| Orders | |
|  Chionasterales  | |
The Tremellomycetes are a class of dimorphic fungi in the Agaricomycotina. Some species have gelatinous basidiocarps (fruiting bodies) or (microscopically) a sacculate parenthesome. [1] There are six orders, 17 families, and 39 genera in the Tremellomycetes. [2] [3] Tremellomycetes include yeasts, dimorphic taxa, and species that form complex fruiting bodies. [4] Tremellomycetes include some fungi that are human and animal pathogens in the genera Cryptococcus , Naganishia , Papiliotrema , and Trichosporon and some fungi that are cultivated for food in the genera Tremella and Naematelia .
TremellomycetidaeLocq. is a class of lichen in the Basidiomycota division. [5]  It only held one order, Tremellales. It was also a former class within the fungi system, up until the late 1990s. [6]  Swann and Taylor in their revision in 1995 had two classes in the Hymenomycetes: Hymenomycetidae (containing non-yeast fungi, mushrooms and puffballs) and Tremellomycetidae (holding the rest). [7]  [8]  Subsequent revisions to the fungi system removed it in favour of Tremellomycetes. [9]