what color is penicillin mold
Penicillium. Description. Penicillium is a fungus, and is the most abundant mold source in soil. There are more than 150 species of penicillium. Penicillium that is more than two-weeks old is bluish in color. Penicillium is a cryophilic fungi, which means it likes the cold, growing best at 34 degrees (the temperature of a refrigerator). It is xerophilic, which means it can obtain moisture from the air if humidity is at 60% or higher. Photos.