Blue mold is a common term used to describe the blue-green powdery fungus that can grow on various surfaces such as fruit, cheese, and bread. However, there are different synonyms for this term, including Penicillium spp., which is a group of molds that display a blue or green color when they grow on organic matter. Another synonym is Aspergillus spp., which can cause blue-green mold on food and crops and can trigger allergic reactions in sensitive individuals. Glaucous mold is also another term for blue mold, referring to the gray-green powdery coating on fruits and vegetables such as grapes and cucumbers.