The twisted mass formed when hyphae grow together is called a mycelium.

Here's a breakdown:

* Hyphae: Long, branching filaments that make up the body of a fungus.

* Mycelium: A network of interwoven hyphae. It's the vegetative part of a fungus, responsible for absorbing nutrients and water.

The mycelium can be found in various forms, from the fluffy white mold on bread to the vast underground networks of mushrooms.