The wall dividing individual cells in a fungal filament is called a

thallus

hypha

mycelium

septum

septum

Explanation:

More complex fungi have septate hypha, that is, there are dividing walls (septum) that separate the filament internally into more or less similar segments. In each septum there are pores that allow free movement of cytoplasmic material from one compartment to another. In short, the septum is a wall that divides the individual cells into a fungal filament.

Each septate of the septate hyphae has a central hole through which cytoplasm and nuclei pass from one cell to another. As a result, even septate hyphae are considered to be cenocytic structures, and the septum-delimited compartments are not true cells. In most fungi, hyphae are formed by haploid nuclei.