Shelby is a plant breeder who is trying to identify the cause of a disease among a group of trees. She observes that the organism reproduces through spores and has reproductive structures that are shaped like a sac. Which type of fungus is it?

Ascomycota are called sac fungi because they produce spores in sac-shaped reproductive structures called asci. Since Shelby observes sac-shaped structures and reproduction by spores, the fungus is Ascomycota. Basidiomycota produce spores on club-shaped structures instead.

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