results in formation of anatomical entity basidiospore basidiospore formation biological_process The process in which spores form outside a specialized end cell known as a basidium. Basidia are characteristic of the basidiomycete fungi (phylum Basidiomycota), and give rise to spores that each contain a haploid nucleus that is the product of meiosis. The spores are usually attached to the basidium by short spikes called sterigmata (singular: sterigma). In most basidiomycetes there are four sterigmata (and four spores) to a basidium. GO:0034295 Note that basidiospores and basidia are separate biological structures. The basidium is the structure that bear the basidiospores, but the development of the basidium is a different process than the formation of the basidiospores themselves. For this reason, GO:0034295 basidiospore formation and GO:0075313 basidium development are different terms and are not linked. sexual sporulation resulting in formation of a cellular spore anatomical structure formation involved in morphogenesis