Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
   Subphylum Agaricomycotina Doweld (2001)
     Class Tremellomycetes Doweld (2001)
       Order Tremellales Fr. (1821)
         01 Family Bulleraceae Xin Zhan Liu, F.Y. Bai, M. Groenew. & Boekhout (2015)
         02 Family Bulleribasidiaceae Xin Zhan Liu, F.Y. Bai, M. Groenew. & Boekhout (2015)
         03 Family Carcinomycetaceae Oberw. & Bandoni (1982)
         04 Family Cryptococcaceae Kütz. ex Castell. & Chalm. (1919)
         05 Family Cuniculitremaceae J.P. Samp., R. Kirschner & M. Weiss (2001)
         06 Family Naemateliaceae Xin Zhan Liu, F.Y. Bai, M. Groenew. & Boekhout (2015)
         07 Family Phaeotremellaceae Yurkov & Boekhout (2015)
         08 Family Phragmoxenidiaceae Oberw. & R. Bauer (1990)
         09 Family Rhynchogastremaceae Oberw. & B. Metzler (1989)
         10 Family Sirobasidiaceae Lindau (1897)
         11 Family Tremellaceae Fr. (1821)
         12 Family Trimorphomycetaceae Xin Zhan Liu, F.Y. Bai, M. Groenew. & Boekhout (2015)
         13 Genus Biatoropsis Räsänen (1934), incertae sedis
         14 Genus Dictyotremella Kobayasi (1971), incertae sedis
         15 Genus Neotremella Lowy (1979), incertae sedis
         16 Genus Sigmogloea Bandoni & J.C. Krug (2000), incertae sedis
         17 Genus Sirobasidium Lagerh. & Pat. (1892), incertae sedis
         18 Genus Sirotrema Bandoni (1986), incertae sedis
         19 Genus Tremellina Bandoni (1986), incertae sedis
         20 Genus Xenolachne D.P. Rogers (1947), incertae sedis