Stachybotrys is a genus of molds, or asexually-reproducing, filamentous fungi. Closely related to the genus Memnoniella,  most Stachybotrys species inhabit materials rich in cellulose. The genus has a widespread distribution, and contains about 50 species.
The most infamous species, S. chartarum (also known as S. atra) is known as “black mold” or “toxic black mold,” and is frequently associated with poor indoor air quality that arises after fungal growth on water-damaged building materials. It is known to produce trichothecene mycotoxins including satratoxins.