Abstract. Blue cheeses undergo complex fermentation and maturation processes mainly . Blue mold cheeses are made using spore suspensions of Penicillium. Jul 4, Learn about blue cheese, ripened with cultures of the mold Penicillium. Making blue cheese requires steps that differ from standard. Nov 1, Penicillium roqueforti and Penicillium glaucum, which are the blue moulds used for cheese, cannot produce these toxins in cheese.