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)
         Family Cainiaceae J.C. Krug (1978), incertae sedis
           1 Genus Amphibambusa D.Q. Dai & K.D.Hyde (2015)
           2 Genus Arecophila K.D.Hyde (1996)
           3 Genus Atrotorquata Kohlm. & Volkm.-Kohlm. (1993)
           4 Genus Cainia Arx & E. Müll. (1955)