| Noun | 1. | order Ustilaginales - parasitic fungi causing smuts; sometimes placed in class Tiliomycetes fungus order - the order of fungi 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 smut fungus, smut - any fungus of the order Ustilaginales family Ustilaginaceae, Ustilaginaceae - a fungus family of loose smuts family Tilletiaceae, Tilletiaceae - a family of smut fungi having a simple promycelium bearing the spores in an apical cluster |