青霉, or Penicillium, is a genus of fungi known for its role in the production of antibiotics, particularly penicillin. This mold is commonly found in soil and decaying organic matter, and it can also grow on food, especially fruits and bread. In addition to its medical significance, 青霉 is used in the production of certain cheeses, such as blue cheese. The mold contributes to the flavor and texture of these cheeses, making it an important element in both culinary and pharmaceutical applications.