Four major phyla of Fungi, based on the method of producing sexual spores:
Chytridiomycota— sexual and asexual spores motile, with posterior flagella
Zygomycota— sexual spores are thick walled resting spores called zygospores
Ascomycota—spores borne internally in a sac called an ascus
Basidiomycota—spores borne externally on a club-shaped structure called a basidium
“deuteromycetes” or Fungi Imperfecti, have no known sexual state in their life cycle.
The four fungal phyla, plus another group, the deuteromycetes, which have no known sexual state. These are described further and pictured on the next several slides.