Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Leotiomycetes O.E. Erikss. & Winka (1997)
       Family Myxotrichaceae Currah (1985)
         1 Genus Byssoascus Arx (1971)
         2 Genus Gymnostellatospora Udagawa, Uchiy. & Kamiya (1993)
         3 Genus Myxotrichum Kunze (1823), nom. sanct.
         4 Genus Pseudogymnoascus Raillo (1929)