Kingdom Fungi R.T.Moore (1980) - fungi
   Subkingdom Dikarya Hibbett, T.Y. James & Vilgalys (2007)
     Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
       Subphylum Agaricomycotina Doweld (2001)
         Class Agaricomycetes Doweld (2001)
           Order Trechisporales K.H. Larss. (2007), incertae sedis
             1 Genus Trechispora P.Karst. (1890)
             2 Genus Sistotremastrum J.Erikss. (1958)
             3 Genus Porpomyces Jülich (1982)