What Is Black Mold? Stachybotrys chartarum Media sensationalism has caused a great deal of fear about black mold. But not all black molds are toxic, and not all "toxic molds" are black. So, what is black mold? Toxic black molds Stachybotrys chartarum and Aspergillus niger are 2 of the black molds that are toxic (toxigenic), ie., they produce mycotoxins. These two black … [Read more...] about What Is Black Mold? Black mold symptoms, toxic mold