Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Chaetothyriomycetidae Doweld (2001)
         Order Chaetothyriales M.E.Barr (1987)
           Family Pyrenotrichaceae Zahlbr. (1926) [monotypic]
             1 Genus Pyrenothrix Riddle (1917)