Basidiospores are produced on
Basidiospores are sexual meiospores characteristic of Basidiomycota produced exogenously on club-shaped basidium functioning as meiosporangium. Following karyogamy and meiosis inside basidium, four haploid nuclei migrate into developing spore primordia on sterigmata at basidial apex. Basidium may be holobasidium non-septate or phragmobasidium septate in rusts. Ascus harbors ascospores inside, sporangium contains sporangiospores, conidiophore bears conidia asexually. Basidial position ensures forcible spore discharge via Buller's drop mechanism aiding wind dispersal from mushrooms, bracket fungi and puffballs efficiently. Detailed ascocarp development involves haploid mating, dikaryotic growth and eventual ascus formation within protective tissue layers regulating moisture.
Ref: Campbell Biology 12th ed., Chapter 31: Basidium Basidiospores Formation; NCERT Class 11 Basidiomycetes Reproduction; NCBI Basidiospore Development