The organisms in kingdom fungi include mushrooms, yeasts, molds, rusts, smuts, puffballs, truffles, morels, and molds. More than 70,000 species of fungi have been identified.T he fungi constitute and independent group to that of plants and animals. The structure of cell wall is similar to plants but chemically the fungi cell wall are composed of chitin. 2  Fungi are heterotrophic organisms. 3  They fungi digest the food first and then ingest the food, to accomplish this the fungi produce exoenzymes. 4  Fungi store their food as starch.