Noun
The white threads or filamentous growth from which a mushroom or fungus is developed; the so-called mushroom spawn.
Source: Webster's dictionaryGrowing the mycelium of the Chaga mushroom under laboratory conditions provides an ecologically friendly alternative supply of this unique medicinal mushroom. Paul Stamets
By extension, the term "mushroom" can also designate the entire fungus when in culture; the thallus (called a mycelium ) of species forming the fruiting bodies called mushrooms; or the species itself. Source: Internet
In most species, the basidiospores disperse and each can start a new haploid mycelium, continuing the lifecycle. Source: Internet
Except for lichens, the non-reproductive (vegetative) mycelium of most ascomycetes is usually inconspicuous because it is commonly embedded in the substrate, such as soil, or grows on or inside a living host, and only the ascoma may be seen when fruiting. Source: Internet
Another microscopic view of a mycelium. Source: Internet
He watched conidia in the soil and their infection of the tubers, observing that mycelium could survive the cold winter in the tubers. Source: Internet