Some are parasites-feeding on organic matter that is still part of a living host. Some have crosswalls to separate cells. In some, the walls between cells disappears. All transport nutrients to other parts of the organism. Digestion occurs outside the fungal body.
Some fungi have a dikaryotic stage to the life cycle.
A dikaryotic stage occurs when two gametes meet, the cytoplasm unites, but the nuclei do not. Fungi often have cells with central vacuoles. Cell walls contain Chintin. Most numerous group of Fungi. Yeasts belong to this class and are single celled.