Phylum Ascomycota Caval.-Sm. (1998) - sac fungi
   Subphylum Pezizomycotina O.E. Erikss. & Winka (1997)
     Class Lecanoromycetes O.E. Erikss. & Winka (1997)
       Subclass Lecanoromycetidae P.M.Kirk, P.F. Cannon, J.C. David & Stalpers ex Miądl., Lutzoni & Lumbsch (2007)
         Order Teloschistales D.Hawksw. & O.E. Erikss. (1986)
           Family Letrouitiaceae Bellem. & Hafellner (1982) [monotypic]
             Genus Letrouitia Hafellner & Bellem. (1982)