The ascus is a sexual fruit of ascomycetes having a globose shape but no ostile (opening) is known as

The ascus is a sexual fruit of ascomycetes having a globose shape but no ostile (opening) and is known as Chleistothecia.
An ascus 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 mitotic cell division.
Ascospores are nonmotile, usually single-celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes.