Mushrooms are various species of fungi with fruiting bodies large enough to be seen clearly by the naked eye. Most fungi termed "mushrooms" belong to the Class Agaricomycetes.Agaricomycetes is further divided into seventeen orders, Agaricales, Atheliales, and Boletales in the Subclass Agaricomycetidae: Geastrales, Gomphales, Hysterangiales, and Phallales in the Subclass Phallomycetidae. The relationship of the orders Auriculariales, Cantharellales, Corticiales, Gloeophyllales, Hymenochaetales, Polyporales, Russulales, Sebacinales, Thelephorales, and Trechisporales are still being sorted out.