Conidium

A conidium ( ; pl.: conidia), sometimes termed an asexual chlamydospore or chlamydoconidium (pl.: chlamydoconidia), is an asexual, non-motilespore of a fungus. The word conidium comes from the Ancient Greek word for dust, (kónis). Some conidia are also called mitospores due to the way they are generated through the cellular process of mitosis. They are produced exogenously. The two new haploid cells are genetically identical to the haploid parent, and can develop into new organisms if conditions are favorable, and serve in biological dispersal.

Asexual reproduction in ascomycetes and basidiomycetes is by the formation of conidia, which are borne on specialized stalks called conidiophores. The morphology of these specialized conidiophores is often distinctive between species and, before the development of molecular techniques at the end of the 20th century, was widely used for identification of (e.g.Metarhizium) species. In aquatic environments, like on driftwood or in streams, conidiogenesis are common strategies.

The terms microconidia and macroconidia are sometimes used.