Of the more than 1.5 million species of mold estimated to exist, a few are especially likely to blame for your spoiled slice. “One of the most common culprits is Rhizopus stolonifer,’” Dr. Detwiler ...

But other molds, like Rhizopus stolonifer, can have permanent effects. And you might recognize this mold since it commonly grows on bread: blue-green, with black splotches, and super fuzzy.