If the cells' cell walls thicken before they separate from each other, they are called chlamydospores. Fission involves splitting of a cell into two daughter cells whereas budding involves production of a small outgrowth in a cell which will eventually grow into new cell. Example of fungi that reproduce by fission or budding is yeast. Mitotic spores are either borne inside a sporangium and are then called sporangiospores or they develop exogenously at the tip or side of a hyphae and are then called conidia. Flagellate motile sporangiospores are called zoospores while the non-motile sporangiospores are usually called aplanospores.
Sexual reproduction involves karyogamy and meiosis.
It results in recombination and formation of new genotypes which enable the fungus to adapt to various environmental conditions. Sexual organs of fungi are generally called gametangia. The male gametangium is called an antheridium. Female gametangium, depending on the group, is called an oogonium or an ascogonium.