Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Sordariomycetes O.E. Erikss. & Winka (1997)
       Subclass Xylariomycetidae O.E. Erikss. & Winka (1997)
         Order Amphisphaeriales D.Hawksw. & O.E. Erikss. (1986)
           Family Apiosporaceae K.D.Hyde, J. Fröhl., Joanne E. Taylor & M.E.Barr (1998)
             Genus Endocalyx Berk. & Broome (1876)