Phylum Basidiomycota R.T.Moore (1980) - basidiomycetes
   Subphylum Agaricomycotina Doweld (2001)
     Class Agaricomycetes Doweld (2001)
       Order Agaricales Underw. (1899)
         Family Crassisporiaceae Vizzini, Consiglio & M. Marchetti (2019)
           1 Genus Crassisporium Matheny, P.-A. Moreau & Vizzini (2014)
           2 Genus Romagnesiella Contu, Matheny, P.-A. Moreau, Vizzini & A. de Haan (2014)