The four types of fungi, which correspond to the four major phyla of the kingdom fungi, include Ascomycota, Basidiomycota, Zygomycota and Deuteromycota. Around 100,000 species have been classified as members of these divisions.
Fungi are multicellular heterotrophic organisms that rely on external food sources for their nutrients. A majority of fungi are decomposers, while others live as parasites in plants and animals. Some examples of Ascomycota fungi are yeasts, truffles and morels, while mushrooms and shelf fungi are members of Basidiomycota. Some known organisms of Zygomycota are black molds commonly found in bread. Deuteromycota, also referred to as Fungi Imperfecti, consist of some pathogenic and cheese-making fungi.