Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Sordariomycetes O.E. Erikss. & Winka (1997)
       Subclass Sordariomycetidae O.E. Erikss. & Winka (1997)
         Order Diaporthales Nannf. (1932)
           Family Gnomoniaceae G.Winter (1885), nom. cons.
             Genus Plagiostoma Fuckel (1870), nom. protect.