What is Mycelium? - Definition & Function

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  • 0:00 Definition
  • 0:23 The Structure of Mycelium
  • 1:32 Function
  • 2:19 Lesson Summary
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Lesson Transcript
Instructor: Brekke Peterson Munks
You have probably seen mycelium in your kitchen cupboard or refrigerator. Not sure what mycelium is? Read on. In this lesson, you will explore the definition of mycelium and the function and importance of these structures in nature.


Have you ever seen the spiderweb-like structures that grow on moldy bread or a rotten tomato? These strings are often white or cream colored and grow in long fibers called hyphae. This structure, as a whole, is the vegetative structure of fungi called the mycelium. Mycelium is typically found in soils and on other organic matter.

Oyster mushroom mycelium growing on coffee grounds.

The Structure of Mycelium

To understand mycelium, you must first understand fungi. Fungi are specialized eukaryotes that can break down very complex structures in nature. They have cell walls rich in chitin (the hard material found in the exoskeleton of insects) and utilize asexual reproduction through spore release. These spores have the ability to turn into mycelium. However, a mycelium is asexual until it joins with another mycelium to form a dikaryotic mycelium. These mycelium can then create fruiting bodies, more commonly known as mushrooms.

It should be noted that fruiting bodies only occur when nutrients, gas exchange and temperature are adequate to produce them. Too much moisture or drought-like conditions are not conducive to mushroom growth.

Mycelium come in many sizes, from very tiny to as large as a forest. These mycelium are made up of rigid cell walls, allowing them to move through soil or other environments that require extra protection. Under a microscope, mycelium can look like little trees before fruiting bodies mature.

Early growth of mycelium under a microscope. Notice how it looks similar to a tree.

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