Class Ascomycetes, also known as Saccharomycetes or sac fungi, is a group of fungi characterized by the production of spores called ascospores in sac-like structures known as asci. Some common synonyms for this group include Discomycetes, Pyrenomycetes, Eurotiomycetes, and Hemiascomycetes, which are based on different classifications and characteristics of these fungi. Discomycetes, for instance, are known for their cup-shaped fruiting bodies and include morels and cup fungi, while Pyrenomycetes are characterized by their spherical or flask-shaped fruiting bodies and include black truffles and ergot fungi. Eurotiomycetes, on the other hand, are commonly found in soil and plant debris, while Hemiascomycetes are a type of yeast that is used extensively in food and beverage production.