Here are some other defining characteristics of sac fungi:
* Diverse group: They include yeasts, molds, truffles, morels, and many other species.
* Mostly multicellular: Though yeasts are unicellular, most sac fungi have a multicellular structure.
* Important decomposers: Many are essential for breaking down organic matter in the environment.
* Important symbionts: Some form symbiotic relationships with plants, such as mycorrhizae, which help plants absorb nutrients from the soil.
* Economic importance: Some sac fungi are used in food production (e.g., yeast for bread and beer), while others are used in medicine (e.g., penicillin).
* Some cause diseases: Some species are pathogens of plants and animals.
The formation of spores within asci is a defining feature that sets them apart from other fungal groups.
