Final answer:
The wall dividing individual cells in a fungal filament is called a septum. Some fungi have hyphae without septa, which are called coenocytic hyphae.
Step-by-step explanation:
The wall dividing individual cells in a fungal filament is called a septum. Most fungal hyphae are divided into separate cells by end walls called septa. These septa have tiny holes that allow for the flow of nutrients and small molecules from cell to cell along the hyphae. However, some fungi have hyphae without septa, which are called coenocytic hyphae and are formed by large cells containing many nuclei.