The rusts (Uredinales) are an even larger grouping of plant parasites, with over 4,000 known species.    From Wordnik.com.  [Huitlacoche] Reference

Myxomycota, Oomycota, Chytrodiomycota, Zygomycota, Ascomycota, Deuteromycota, Basidiomycota: Uredinales and Ustilaginales.    From Wordnik.com.  [Managing biodiversity conservation in a changing environment of the Arctic] Reference