While some fungi are unicellular, like yeasts, many are multicellular, forming complex structures like mushrooms, molds, and mycorrhizae.

Here's a breakdown:

* Unicellular fungi: These are single-celled organisms, like yeasts, that can reproduce through budding.

* Multicellular fungi: These are made up of many cells organized into filaments called hyphae. These hyphae intertwine to form a network called a mycelium.

So, fungi are a diverse group with both unicellular and multicellular representatives.