Deuteromycetes is a fungal group that is also known as fungi imperfecti. This term was coined because unlike other fungi, deuteromycetes do not have a known sexual reproduction stage. Other synonyms for deuteromycetes include pyrenomycetes and coelomycetes, which refer to the type of fruiting body that the fungi produce. Deuteromycetes are also sometimes referred to as mold or mildew, which are common types of fungal growths found in damp and humid environments. Despite their lack of sexual reproduction, deuteromycetes play important roles in nature as decomposers and plant pathogens. Understanding the different synonyms for deuteromycetes helps to better describe and classify these important fungi.