Answer: Mycelia are the vegetative parts of fungi, sort of like a mass of microscopic “sprouts” that are called hyphae. The myceliumis a network collection or bundle of filamentous hyphae. Unlike the individual hyphae, the mycelial mass is visible to the naked eye in the form of mold on various surfaces. The whole mushroom as we know it is the fruiting body of this mycelial mass of hyphae. In biological terms, the hyphae and mycelium are the asexual phase of the lifecycle and the mushroom fruiting body is the sexual phase. The hyphae and mycelium are very important in fungi nutrition. It is through the mycelium that a fungus absorbs nutrients from its environment which allows it to “bear fruit”, creating a mushroom.