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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. [GOC:di, GOC:ds, GOC:mah, GOC:mcc, http://www.gsbs.utmb.edu/microbook/ch073.htm, http://www.ilmyco.gen.chicago.il.us/Terms/basid133.html]
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