organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Fungi R.T.Moore (1980) - fungi
       Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
         Class Ascomycetes G.Winter (1880) see Phylum Ascomycota Caval.-Sm. (1998)
           Subclass Leotiomycetidae see Class Leotiomycetes O.E. Erikss. & Winka (1997)
             Order Helotiales Nannf. (1932)
               01 Family Ascocorticiaceae J.Schröt. (1893)
               02 Family Bulgariaceae Fr. (1849) see Family Phacidiaceae Fr. (1821)
               03 Family Cudoniaceae P.F. Cannon (2001)
               04 Family Cyttariaceae Speg. (1887)
               05 Family Dermateaceae Fr. (1849)
               06 Family Geoglossaceae Corda (1838)
               07 Family Helotiaceae Rehm (1892), nom. cons.
               08 Family Hemiphacidiaceae Korf (1962) see Family Cenangiaceae Rehm (1888)
               09 Family Hyaloscyphaceae Nannf. (1932)
               10 Family Leotiaceae Corda (1842)
               11 Family Loramycetaceae Dennis ex Digby & Goos (1988)
               12 Family Phacidiaceae Fr. (1821)
               13 Family Rutstroemiaceae Holst-Jensen, L.M. Kohn & T. Schumach. (1997)
               14 Family Sclerotiniaceae Whetzel ex Whetzel (1945)
               15 Family Vibrisseaceae Korf (1991)