- loose smut - disease of grains; the entire head is a dusty mass of spores
--1 is a kind of smut
- 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
--2 is a kind of smut, smut fungus
--2 is a member of Ustilago, genus Ustilago - 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