Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Sordariomycetes O.E. Erikss. & Winka (1997)
       Subclass Diaporthomycetidae Senan., Maharachch. & K.D.Hyde (2015)
         Order Diaporthales Nannf. (1932)
           Family Harknessiaceae Crous (2012)
             Genus Harknessia Cooke (1881)