sporulation
by far the most important type of asexual reproduction is that of spore formation. Asexual reproduction is extremely important to fungi. It is responsible for the production of large numbers of spores throughout the year. these asexual spores are formed on a phase of the fungi life cycle termed in some texts as the mitosporic, or anamorphic phase. There can be more than one mitosporic state for each species of fungus, and in some cases the mitosporic state of very different species can look very similar. This has contributed to the problems of creating a taxonomy for the fungi that only possess mitosporic states. The sexual stage of the fungus can be termed the teleomorph, and the characteristics of this phase of the life cycle are much more stable and reliable for taxonomic purposes.
The onset of asexual reproduction is controlled by many different things. Some are environmental, like nutrient levels, Co2 levels, light levels. Others can fungi have internal time clocks and sporulate anyway in a preset part of the fungal life cycle designed to spread and maximize colonization during one season.