Rye smut

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rye smut --> ergot

(Science: botany) A disease of cereal plants (rye, wheat, etc.) caused by the fungus claviceps purpurea, this fungus produces toxic alkaloids that, if ingested, cause symptoms such as hallucinations, severe gastrointestinal upset, a burning sensation in the limbs and extremities (St. Anthony's fire) and a form of gangrene.