| urocystis | (n) a genus of smut fungi belonging to the family Tilletiaceae, Syn. genus Urocystis |
| onion smut | (n) smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings, Syn. Urocystis cepulae |
| wheat flag smut | (n) fungus affecting leaves and stems of wheat, Syn. Urocystis tritici |