The evolutionary tree shown is not complete it only shows the main divisions of the fungi kingdom and the family's that I have photos for. The major divisions are based upon the reproductive structures, and similarities in life cycles. As further research continues, their position within the evolutionary tree can change.

Kingdom: Fungi

	Division: Eumycota (septate fungi)
		Subdivision: Ascomycotina
			Class: Euascomycetes
				Subclass: Leotiomycetidae.
					Order: Helotiales
						Family: Bulgariaceae Family: Cyttariaceae Family: Leotiaceae Family: Geoglossaceae Family: Helotiaceae Family: Vibrisseaceae
				Subclass: Pezizomycetidae
					Order: Pezizales
						Family: Discinaceae Family: Pezizaceae Family: Pyronemataceae Family: Sarcoscyphaceae Family: Sarcosomataceae
				Subclass: Pyrenomycetidae
					Order: Xylariales
						Family: Xylariacea
					Order: Hypocreales
						Family: Hypocreaceae Family: Clavicipitaceae
					Order: Sordariales
						Family: Lasiosphaeriaceae
					Order: Eurotiales
						Family: Trichocomaceae
		Subdivision: Basidiomycotina
			Class: Hymenomycetes
				Subclass: Holobasidiomycetidae (Homobasidiomycete Fungi) (substantial mushrooms)
					Order: Agaricales
						Family: Agaricaceae Family: Bolbitiaceae Family: Clavariaceae Family: Coprinaceae Family: Cortinariaceae Family: Entolomataceae Family: Hydnangiaceae Family: Marasmiaceae Family: Pleurotaceae Family: Pluteaceae Family: Schizophyllaceae Family: Strophariaceae Family: Tricholomataceae
					Order: Boletales
						Family: Boletaceae Family: Boletinellaceae Family: Calostomataceae Family: Gyrodontaceae Family: Paxillaceae Family: Rhizopogonaceae Family: Sclerodermataceae Family: Suillaceae
					Order: Cantharellales
						Family: Cantharellaceae Family: Clavulinaceae Family: Hydnaceae
					Order: Dacrymycetales
						Family: Dacrymycetales
					Order: Gomphales
						Family: Gomphaceae Family: Hysterangiaceae Family: Phallaceae
					Order: Hymenochaetales
						Family: Hymenochaetaceae
					Order: Polyporales
						Family: Ganodermataceae Family: Gloeophyllaceae Family: Meripilaceae Family: Podoscyphaceae Family: Polyporaceae Family: Steccherinaceae
					Order: Russulales
						Family: Auriscalpiaceae Family: Corticiaceae Family: Hericiaceae Family: Meruliaceae Family: Rusulaceae Family: Stereaceae
					Order: Thelephorales
						Family: Bankeraceae Family: Thelephoraceae
				Subclass: Phragmobasidiomycetidae (Heterobasidiomycete Fungi)
					Order: Auriculariales
						Family: Auriculariaceae
					Order: Tremellales
						Family: Exidiaceae Family: Tremellaceae Family: Tremellodendropsidaceae

Fungi of this Subdivision lack a sexual stage and are consequently called the Fungi Imperfecti because their life cycles are "imperfect". Most reproduce by conidia. The majority are the microscopic moulds important as pathogens. Many fungal diseases that infect humans belong to this subdivision.

Are the only class of fungi whose mycelium is normally aseptate. Septate typically only form to delineate reproductive structures or to isolate damaged portions of mycelium. They reproduce by either sexual or asexual means and have simple reproductive bodies then Ascomycetes and Basidiomycetes. Most are moulds e.g. pin mould, as seen on bread.

A lichen is not a single organism, but rather it's a combination of two organisms which live together intimately. Most of the lichen is composed of fungal filaments, but living among the filaments are algal cells. See the Forest Lichen pages