What is the key difference between fungi and funguslike protists?

The primary distinction between fungi and funguslike protists lies in their cellular composition, specifically regarding their cell walls. Fungi possess chitin in their cell walls, which provides structural support and is a key characteristic of this kingdom. In contrast, the cell walls of funguslike protists are typically composed of different materials, such as cellulose, which is found in plant cell walls.

This characteristic is significant because it reflects the evolutionary differences between these two groups. Chitin, being a nitrogen-containing polysaccharide, is unique to fungi and contributes to their robustness and ability to form various structures, such as fruiting bodies. As for funguslike protists, they can share certain properties with fungi, like being heterotrophic (obtaining nutrients from organic material), but their cellular structure sets them apart functionally and evolutionarily from true fungi.