Asexual reproduction of fungi may take place by a variety of ways. The unicellular forms may multiply by cell division, fission or budding. Yeasts multiply either by fission as observed in the species of Schizosaccharomyces, or by budding in members of Saccharomyces. Some ascospores and basidiospores may also multiply by budding.
The hyphal forms can multiply by fragmentation which may occur accidentally, or, in some fungi, it may occur through production of oidia or arthrospores. These thin-walled spores arise by cleavage of hyphae through splitting of the septa. In some fungi, the hyphal cells can produce thin-walled spores by budding. These spores are called blastospores.
In many fungi, asexual reproduction occurs through production of more specialized spores. Such spores may be produced in special sacs, known as sporangia and the spores are known as sporangiospores. Spores may also be motile and, in that case they are called zoospores.