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|Noun||1.||Urocystis - a genus of smut fungi belonging to the family Tilletiaceae|
fungus genus - includes lichen genera
family Tilletiaceae, Tilletiaceae - a family of smut fungi having a simple promycelium bearing the spores in an apical cluster
flag smut fungus - a smut fungus causing a smut in cereals and other grasses that chiefly affects leaves and stems and is characterized chains of sori within the plant tissue that later rupture releasing black masses of spores