Dick, 1976 Pseudofungi is a grouping of heterokonts,[2][3] also known as the Heterokontimycotina.

[4] Although numerous biochemical, ultrastructural, and genetic traits clearly place them in the heterokonts, their growth form (featuring hyphae) and mode of nutrition (osmotrophy) resemble that of fungi (which are not closely related).

[4] It is believed that pseudofungi descend from unicellular algae among the Stramenopiles which lost their plastids.

[5] From this, a unicellular heterotroph proto-pseudofungi (probably a mushroom parasite) got its fungal genes through horizontal gene transfer, which would have led to the development of convergent fungal multicellularity,[6] explaining why the cell wall is sometimes made of both chitin and cellulose.

The group's interrelationships are as follows: Developayella Oomycetes Hyphochytriomycetes