Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
Status: extant
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
  Status: extant
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
    Status: extant
       Subclass Dothideomycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers ex C.L. Schoch, Spatafora, Crous & Shoemaker (2007)
      Status: extant
         Order Capnodiales Woron. (1925)
        Status: extant
           Family Extremaceae Quaedvl. & Crous (2014), nom. inval.
          Status: extant
             Genus Extremus Quaedvl. & Crous (2014), nom. inval.
            Status: extant