1. Each Ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division.

2. An ascus (plural Asci; from Greek ἀσκός ảskós 'skin bag') is the sexual spore-bearing cell produced in ascomycete fungi.Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division