Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Leotiomycetes O.E. Erikss. & Winka (1997)
       Order Helotiales Nannf. (1932)
         Family Rutstroemiaceae Holst-Jensen, L.M. Kohn & T. Schumach. (1997)
           1 Genus Lambertella Höhn. (1918)
           2 Genus Lanzia Sacc. (1884)
           3 Genus Poculum Velen. (1934)
           4 Genus Rutstroemia P.Karst. (1871), nom. cons.
           5 Genus Scleromitrula S.Imai (1941)