[3][4] Informally known as zygomycetes I, Mucoromycota includes Mucoromycotina, Mortierellomycotina, and Glomeromycotina, and consists of mainly mycorrhizal fungi, root endophytes, and plant decomposers.

[10] Mortierellomycotina are common soil fungi that occur as root endophytes of woody plants and are isolated as saprobes.

[11] Glomeromycotina live in soil, forming a network of hyphae, but depend on organic carbon from host plants.

[6] Shown in Mucorales, sexual reproduction is under the control of mating type genes, sexP and sexM, which regulate the production of pheromones required for the maturation of hyphae into gametangia.

Glomeromycotina also form coenocytic hyphae with highly branched, narrow hyphal arbuscules in host cells.

[3] Mucoromycota's metabolism can utilize many substrates that are from various nitrogen and phosphorus resources to produce lipids, chitin, polyphosphates, and carotenoids.

[20] Mucoromycota are capable of accumulating high amounts of lipids in their cell biomass, which allows the fungi to produce polyunsaturated fatty acids and carotenoids.