Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Eurotiomycetes O.E. Erikss. & Winka (1997)
       Subclass Chaetothyriomycetidae Doweld (2001)
         Order Pyrenulales Fink ex D.Hawksw. & O.E. Erikss. (1986)
           01 ?Family Monoblastiaceae W. Watson (1929)
           02 Family Pyrenulaceae Rabenh. (1870)
           03 Family Requienellaceae Boise (1986)
           04 Family Trypetheliaceae Zenker (1827)
           05 Genus Asteroporum Müll.Arg. (1884)
           06 ?Genus Blastodesmia A.Massal. (1852)
           07 Genus Celothelium A.Massal. (1860)
           08 Genus Heufleridium Müll.Arg. (1883)
           09 Genus Micromma A.Massal. (1860)
           10 Genus Mycoporum G. Mey. (1825), nom. rej.
           11 ?Genus Porodothion Fr. (1825)
           12 ?Genus Porothelium Eschw. (1824), nom. illeg.
           13 Genus Rhaphidicyrtis Vain. (1921)
           14 ?Genus Stromatothelium Trevis. (1861)
           15 Genus Xenus Kohlm. & Volkm.-Kohlm. (1992)