Class Deuteromycetes is a group of fungi that lacks sexual reproduction structures, also known as anamorphic fungi. The term Deuteromycetes is now considered obsolete and has been replaced with the term Ascomycota. Ascomycota includes a diverse group of fungi with sexual and asexual reproduction stages. Another synonymous term for Deuteromycetes is mitosporic fungi, which refers to their mode of asexual spore formation. Other synonyms include Fungi Imperfecti, Fungi Incertae Sedis, and Hyphomycetes. These terms are used interchangeably to describe fungi with imperfect stages of reproduction. The use of these synonyms highlights the complexities of fungal classification, which continues to evolve as new species are discovered and classified.