S: (n) covered smut (a smut fungus causing a smut disease of grains in which the spore masses are covered or held together by the grain membranes)
S: (n) loose smut (a smut fungus of the genus Ustilago causing a smut disease of grains in which the entire head is transformed into a dusty mass of spores)
S: (n) onion smut, Urocystis cepulae (smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings)
S: (n) 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)