Here's why:

* Hyphae: These are the thread-like structures that make up the body of a fungus.

* Arrangement: Hyphae can be arranged in various ways, which significantly influences the appearance of the fungus:

* Mycelium: A network of interwoven hyphae, often forming a large, visible mass.

* Fruiting Bodies: These are the reproductive structures of fungi, and their shape and size depend on the arrangement of hyphae. Examples include mushrooms, toadstools, puffballs, and more.

* Other Structures: Some fungi form specialized structures for feeding or spreading spores.

Therefore, the appearance of a fungus (its shape, color, texture, etc.) is directly related to the arrangement of its hyphae.