Definition of Ustilago maydis
1. Noun. A common smut attacking Indian corn causing greyish white swellings that rupture to expose a black spore mass.
Group relationships: Genus Ustilago, Ustilago
Generic synonyms: Corn Smut, Cornsmut
Medical Definition of Ustilago maydis
1. A species that resembles ergot of rye in its metabolic action; its black spores on the ears of corn are dispersed by wind and can cause contamination of laboratory cultures. Synonym: corn ergot, corn smut, Ustilago zeae. (05 Mar 2000)