What are hyphal compartments?
I did a quick lookup on google for &quot;hyphal compartments&quot; and the number of online texts/books/citations using this term is quite meagre to say the least. One of the images that I found was this-

And I have reached to the conclusion that--
Hyphae cells (only in septate species) are known as hyphal compartments.
Quoting from wikipedia (read if you don't know about septate and coenocytic varieties of hyphae)

A hypha (plural hyphae, from Greek ὑφή, huphḗ, “web”) is a long, branching filamentous structure of a fungus, oomycete, or actinobacterium.In most fungi, hyphae are the main mode of vegetative growth, and are collectively called a mycelium.
A hypha consists of one or more cells surrounded by a tubular cell
wall. In most fungi, hyphae are divided into cells by internal
cross-walls called &quot;septa&quot; (singular septum). Septa are usually
perforated by pores large enough for ribosomes, mitochondria and
sometimes nuclei to flow between cells. The major structural polymer
in fungal cell walls is typically chitin, in contrast to plants and
oomycetes that have cellulosic cell walls. Some fungi have aseptate
hyphae, meaning their hyphae are not partitioned by septa.
Hyphae have an average diameter of 4-6 µm.