Mucor is a saprophytic fungus. It grows on decaying dung and on some food stuffs. It shows the best growth on a piece of bread at about 25∘C with relative humidity of about 95% in moist and shady places. Related Theory Mucor is a genus of mould. They are formed from thread-like hyphae that spread out from a visible mycelium. It causes mucormycosis. Most people develop this infection by breathing in mould spores. Less often, infection can develop when spores enter the body through a cut or open wound. It was much prevalent during second wave of COVID-19 (as black fungus) in 2021 in India.