What is spore cases of sac fungi?

Spore cases of sac fungi, known as asci (singular: ascus), are specialized structures where spores are produced. These fungi, belonging to the phylum Ascomycota, typically contain eight ascospores within each ascus. The asci can be found in various fruiting bodies, such as ascocarps, which can take different forms like cleistothecia, perithecia, or apothecia. Upon maturity, the asci release the ascospores into the environment for reproduction and dispersal.