Chaetomium tends to make an appearance on cellulose-based surfaces like drywall, wallpaper, and wood, and it comes with a ...

"Researchers have identified over 100,000 species of mold so far, and they come in various shapes and colors," Rubino said. "Many species, such as Aspergillus and Chaetomium, can appear black.

The concern around mold exposure is minimal. “If you wouldn’t eat a moldy piece of food or brie, then just wash your water bottle,” Kazmierczak said. Chaetomium, a common indoor fungus, can cause ...