A fungus () is any eukaryotic organism that is a member of the kingdom Fungi ().These are the pronunciations listed first in most dictionaries. See, for example, the Merriam-Webster Online entry Alternative pronunciations for fungi include /?f??ga?/, /?f?nd?i/, and /?f??gi/. Funguses (/?f??g?s?z/) is an alternative plural form. The fungi are heterotrophic organisms characterized by a chitinous cell wall, and in the majority of