Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Lecanoromycetes O.E. Erikss. & Winka (1997) Subclass Umbilicariomycetidae Bendiksby, Hestmark & Timdal (2013) [monotypic] Order Umbilicariales J.C. Wei & Q.M. Zhou (2007) Family Fuscideaceae Hafellner (1984) Genus Lettauia D.Hawksw. & R. Sant. (1990)