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1. Stachybotrys chartarum aka Stachybotrys atra has agreenish-black color and is typically found growing on materials with high cellulose and low nitrogen content such as paper, fiberboard, dust, and even lint. Because it requires constant moisture to grow, you’ll commonly see it in areas with excess humidity or water leaks.

2. Aspergillustends to beblack on the surface with yellow or whiteish undertones. Exposure to this mold can cause a group of diseases known as aspergillosis, which are often characterized by lung and breathing issues.

3. Cladosporium is olive green with touches of black and brown. It generally forms in small dots, but as it grows, it merges to form large patches. It’s commonly found in bathrooms, under sinks, and around faucets, but it also grows on materials like carpets, furniture, walls, sheetrock, and flooring.

4. Alternaria has a velvety appearance, can range in color from olive green to gray or black, and sometimes has longer, hair-like growths. Most species of Alternaria are found outdoors, but when it becomes airborne and enters your home, it can grow just about anywhere, including in walls, carpets, crawlspaces, garages, and attics.