"Researchers have identified over 100,000 species of mold so far, and they come in various shapes and colors," Rubino said. "Many species, such as Aspergillus and Chaetomium, can appear black.

However, many times you would have noticed black, dusty mold on the outer covering of onions. Caused by Aspergillus Niger - a ...

While other molds, like Aspergillus flavus, produce toxins that can harm and even kill you. But whether or not you want it around, mold is everywhere. In fact, you're likely breathing it in right now.