Fungi are more closely related to animals than to plants. At some point, animals and fungi diverged. One developed an internal sac through which it digested its nutrients (animals) while the other digested nutrients externally using enzymes to break them down (fungi). Around 120,000 species have been described, but estimates of the total amount of fungal species can be from 2.2 to 3.8 million.

Higher Taxonomy of Fungi
Opisthokont
Holozoa
animal‑like
Holomycota
fungus‑like
animals and fungi
Major Phyla of Fungi
Main groups of fungi.

Proposed by Tederoso et al. in 2016:

Proposed by Krüger et al in 2011: (slightly modified)

Fungi

division Chytridiomycota

division Kickxellomycotina

division Blastocladiomycota

division Mucoromycota (2 classes, 3 orders, 61 genera, 325 species)

subkingdom Dikarya

Entorrhizomycota (1 class, 2 orders, 3 genera)

Ascomycota (3 subdivisions, 20 classes)

Basidiomycota (3 subdivisions, 18 classes)

higher fungi

Glomeromycota (1 class, 4 orders)

In this treatment, we will focus on the higher fungi (Dikarya) and Glomeromycota.