1. A fungus of a large group (phylum Ascomycota) that produces spores in a sac-like structure called an ascus; includes yeasts, cup fungi, and many plant pathogens.
Usage: technical; biology

Examples

• Ascomycetes are among the most diverse fungi on Earth.
• Baker's yeast is an ascomycete commonly used in baking and brewing.
• Many plant diseases are caused by ascomycete fungi.
• The morel mushroom is a prized edible ascomycete.
• Ascomycetes reproduce sexually by forming spores within an ascus.
• Penicillium, the source of penicillin, is an ascomycete.