Mold What to know Mold can look like spots of many different colors, and it can smell musty. If you see or smell mold , you should remove it. If mold is growing in your home, you need to clean up the mold and fix the moisture problem. Learn what mold is, how to prevent it, and how to clean it up. Learn about the types of mold that can grow in your home, the health problems they can cause, and how to prevent and remove them. Find out how to tell if you have a mold problem and what to do if you have a mold allergy. Mold Morphology Molds are multinucleated, filamentous fungi composed of hyphae. A hypha is a branching tubular structure approximately 2-10 µm in diameter which is usually divided into cell-like units by crosswalls called septa. The total mass of hyphae is termed a mycelium. The portion of the mycelium that anchors the mold and absorbs nutrients is called the vegetative mycelium , composed of vegetative hyphae; the portion that produces asexual reproductive spores is the aerial mycelium ... Mold is a type of fungus that forms spores and grows on organic matter. Learn about the diversity, classification, ecology, and applications of molds, as well as their potential health risks and food spoilage.