Commonly called “black mould,” S. chartarum produces dark, slimy, and often greenish-black colonies on cellulose-rich materials such as plasterboard, wallpaper, or wood that remains wet for prolonged periods. Some strains can produce potent mycotoxins, sparking concerns about respiratory and general health effects, especially with chronic exposure. It is most frequently encountered following flooding or in persistently damp buildings. Professional inspection and remediation are usually recommended when Stachybotrys is suspected.