Answer;
-Mycelium
The mycelium is the entire interwoven mass of one multicellular fungal organism.
Step-by-step explanation;
-Mycelium is the vegetative part of a fungus or fungus-like bacterial colony, consisting of a mass of branching, thread-like hyphae. Mycelium extend the area in which a fungi can find nutrients.
-Mycelium grow on organic matter and are asexual until joining with another mycelium. After joining, the two mycelium are capable of creating a fruiting body that produces a mushroom.