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blue mould

noun
1.
Also called green mould. any fungus of the genus Penicillium that forms a bluish mass on decaying food, leather, etc
2.
any fungal disease of fruit trees characterized by necrosis and a bluish growth on the affected tissue: mostly caused by Penicillium species
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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