| flag smut | (n) smut affecting leaves and stems of cereals and other grasses |
| flag smut fungus | (n) 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 |
| wheat flag smut | (n) fungus affecting leaves and stems of wheat, Syn. Urocystis tritici |