Kingdom Fungi R.T.Moore (1980) - fungi
   Phylum Chytridiomycota Doweld (2001)
     Class Spizellomycetes Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, M. Döring, Schigel, T.W. May, M. Ryberg & Abarenkov (2018) [monotypic]
       Order Spizellomycetales D.J.S. Barr (1980)
         Family Powellomycetaceae D.R. Simmons (2011)
           1 Genus Fimicolochytrium D.R. Simmons & Longcore (2012) [monotypic]
           2 Genus Geranomyces D.R. Simmons (2011)
           3 Genus Powellomyces Longcore, D.J.S. Barr & Désauln. (1995) [monotypic]
           4 Genus Thoreauomyces D.R. Simmons & Longcore (2012) [monotypic]