Basidiospores are more or less the same, except that in Basidiomycota, the two haploid nuclei of the parent individuals coexist in the same cell ( even vegetative ones ) for a longer time without undergoing karyogamy.
32.
In a typical Basidiomycota lifecycle the long lasting dikaryons periodically ( seasonally or occasionally ) produce basidia, the specialized usually club-shaped end cells, in which a pair of compatible nuclei fuse ( karyogamy ) to form a diploid cell.
33.
Unlike the hymenoascomycetes, the loculoascomycete ascoma originates prior to karyogamy in the dikaryon, with the correlated character state being the functionally two-walled ascus which ruptures in a fissitunicate ( like a Jack-in-the-box ) fashion.
34.
A discarded hypothesis held that a second karyogamy event occurred in the ascogonium prior to ascogeny, resulting in a tetraploid nucleus which divided into four diploid nuclei by meiosis and then into eight haploid nuclei by a supposed process called brachymeiosis, but this hypothesis was disproven in the 1950s.
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