Phylum Ascomycota Caval.-Sm. (1998) - sac fungi Subphylum Pezizomycotina O.E. Erikss. & Winka (1997) Class Sordariomycetes O.E. Erikss. & Winka (1997) Order Trichosphaeriales M.E.Barr (1983) Family Trichosphaeriaceae G.Winter (1885) Genus Fluviostroma Samuels & E. Müll. (1980)