| Noun | 1. | class Tiliomycetes - category used in some systems to comprise the two orders Ustilaginales (smuts) and Uredinales (rusts) class - (biology) a taxonomic group containing one or more orders Basidiomycota, Basidiomycotina, subdivision Basidiomycota, subdivision Basidiomycotina - comprises fungi bearing the spores on a basidium; includes Gasteromycetes (puffballs) and Tiliomycetes comprising the orders Ustilaginales (smuts) and Uredinales (rusts) and Hymenomycetes (mushrooms, toadstools, agarics and bracket fungi); in some classification systems considered a division of kingdom Fungi |