You can normally find Chaetomium in soil, air, dung, and plant debris. Chaetomium species are initially cottony and white in colour but turn greyish-green as they mature. They grow quickly, feeding off of any materials that contain cellulose such as paper, fabrics and drywall.
The most common species include C. atrobrunneum, C. funicola, C. globosum and C. strumarium.
Chaetomium is highly destructive and can cause infections in humans. However, as with most molds, you can prevent infections with proper cleaning and maintenance of your indoor environment.
If you discover a mold problem in your home, you should seek professional mold remediation as soon as possible. And to prevent the mold from growing back, consistently keep the relative humidity inside your home under 50%.