Ascus

Definition

An ascus is a specialized cell in which spores of ascomycete fungi are formed. It typically contains eight ascospores arranged in a sac-like structure.

5 Must Know Facts For Your Next Test

1. Asci are characteristic of the Ascomycota phylum of fungi, also known as sac fungi.
2. Each ascus usually produces exactly eight ascospores through sexual reproduction.
3. The formation of asci is a key step in the fungal life cycle called meiosis.
4. Asci can be found within larger fruiting bodies called ascocarps or perithecia.
5. The release of ascospores from the ascus often involves mechanisms that ensure wide dispersal for colonization.

Review Questions

Related terms

Ascomycota:

A phylum of fungi characterized by the formation of asci and ascospores.

Ascospore: A spore produced inside an ascus during sexual reproduction.

Ascocarp: A fruiting body that contains multiple asci and facilitates spore dispersal.