Required for spore wall assembly and ascus formation (PubMed:11470404, PubMed:15590821). Involved in the formation and elongation of prospore membranes (PubMed:26605945, PubMed:27303688). Inteacts with SPO71. Punctate location throughout the cytosol in meiosis II cells and peripheral punctate structures in the spore. Belongs to the SPO73 family.