Which group of fungi formed basidia sexual reproduction?

the four nuclei in the Basidiomycota do not remain inside the cell where they divided. Instead they migrate to the tips of horn-like protrusions called sterigmata (singular: sterigma). The tips of the sterigmata enlarge to form solitary basidiospores, each with a nucleus inside. The basidiospores then become separated from the sterigmata by their own walls and can be dispersed.