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ergot, Claviceps purpurea | a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; a fungus that infects various cereal plants forming compact black masses of branching filaments that replace many grains of the plant; source of medicinally important alkaloids and of lysergic acid ❲Claviceps purpurea❳ |