Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Dothideomycetes O.E. Erikss. & Winka (1997)
       Order Collemopsidiales Pérez-Ort., Garrido-Ben. & Grube (2016), incertae sedis [monotypic]
         Family Xanthopyreniaceae Zahlbr. (1926)
           Genus Zwackhiomyces Grube & Hafellner (1990)