blue mold

noun

Also called green mold. any fungus of the genus Penicillium, which forms a bluish-green, furry coating on foodstuffs inoculated by its spores.
Plant Pathology.
- a disease of plants, characterized by necrosis of leaves or fruit and the growth of bluish or grayish mold on affected parts, caused by any of several fungi, as of the genus Penicillium or Peronospora tabacina.
- downy mildew (def. 2).

Origin of blue mold

First recorded in 1655–65

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

blue mold type from Dorsetshire; crumbly, sharp; made in flat forms.
The Complete Book of Cheese | Robert Carlton Brown
Sometimes when the skin of a rotten apple has been broken you will find in the broken place a blue mold.
Agriculture for Beginners | Charles William Burkett
Bread also sometimes has this blue mold; at other times bread has a black mold, and yet again a pink or a yellow mold.
Agriculture for Beginners | Charles William Burkett
The same blue mold that grows on bread often attacks apples that have been slightly bruised; it cannot pierce healthy apple skin.
Agriculture for Beginners | Charles William Burkett
Moisten a piece of bread, then dip a match or a pin into the blue mold on a lemon, and draw the match across the moist bread.
Agriculture for Beginners | Charles William Burkett

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