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Mushroom Life Cycle: 4 Key Stages and Their Features

Mushroom Life Cycle: 4 Key Stages and Their Features cover
Written by Real Mushrooms - Updated: June 13, 2024

Mushrooms are neither plants nor animals; they’re part of the fungi kingdom. Unlike plants, they don’t photosynthesize, and unlike animals, they don’t directly ingest their food.

Instead, mushrooms secret enzymes that digest food externally and then absorb the nutrients through their mycelium (the root-like vegetative body).

But even more unique and fascinating is the mushroom life cycle, which involves four revolutionary stages.

The entire duration of each cycle varies from one mushroom to the other depending on its size and growing environment. Some mushrooms will complete a whole cycle in one day, while for others, it may take up to a month or more.

Read on to learn the basics of the mushroom life cycle. One major advantage of having this knowledge is understanding what you’re getting when you’re buying functional mushroom products. The supplement market is full of products with misleading marketing or label information, and we’re going to help bring clarity to what you might be getting before you buy any mushroom product.

mushroom life cycle

Stage 1 - It All Begins With Spores

Amanita Muscaria mushroom releasing its spores
This Amanita muscaria’s spores are released from the mushroom’s gills. If the spores land on the right surface in the right conditions, they will germinate and begin sprouting little filaments called hyphae. This is the first step in the mushroom growth cycle.

The mushroom life cycle begins with a spore, one of the many billions released from a fully grown mushroom. Different types of mushrooms will have different structures that produce and release spores. Most familiar would be mushroom gills, which are found under mushroom caps. Other common mushroom structures that release spores are pores and teeth. There are some exceptions, such as the puffball mushroom. When jostled, Puffballs shoot a cloud of spores out of an opening at the top of the mushroom.

Related Article: Mushroom Anatomy: A Deep Dive Into the Parts of a Mushroom

Just like a plant would spread its pollen grains to facilitate growth, mushrooms release billions of spores every day to ensure a new generation of mushrooms is brought forth.

The released spores, which are too tiny to be seen by the naked eye, float through the air looking for a suitable place to germinate.

They often settle close to other grown mushrooms or are sometimes carried by wind or insects to another surface.

When the spores find a favorable environment with just the right amount of nutrients and water, they’ll begin to germinate (sprout) and become hyphae, which introduces a new growth stage.

Stage 2 - The Spores Germinate

Mushroom spores can detect when they’ve reached an environment with favorable conditions for their growth.

At this point, the spores will germinate and form what’s referred to as a germ tube—a multicellular outgrowth from a single-celled pore.

The germ tube then begins the process of growing and differentiating through mitosis into hyphae, the basic fungal unit.

Hyphae are long and thin thread-like structures that spread across the growing medium and release chemicals to dissolve food.

The hyphae enable the absorption of nutrients from the soil and environment and transport the nutrients throughout the growing mushroom. This way, the mushroom can get the nutrients and energy it needs to grow evenly.

And because the hyphae contain the mushroom’s genetic material, they’re responsible for finding spores of the opposite sex to bond with.

They’ll go as far as they need to meet their matches. When the meeting happens, two hyphae combine to form a cell of two nuclei.

The network then grows and becomes a sufficiently dense and organized colony. At this point, it’s no longer called hyphae but mycelium.

Stage 3 - The Mycelium Expands

The mycelium’s role is to provide consistent support for the entire ecosystem. That’s why it grows at an exponential rate and spreads everywhere, forming a great underground network.

Mycelium helps break down dead plants and other organic materials in the soil. This releases crucial nutrients back into the soil, which can then be used by plants and other living things. Mycelium also acts as a delivery system of those nutrients in a symbiotic exchange with plants.

As the mycelium offers water and nutrients to the plants, the plants (or trees) in turn provide the mycelium with organic molecules like glucose that the mushroom requires to keep growing.

Mature Lion’s Mane mushroom cultivated on a log
You can clearly see mycelium has saturated the logs used for cultivating mushrooms at the Real Mushrooms farm. The Lion’s mane this mycelium grew into is fully mature and ready to be picked.

Because of the mycelium’s rapid growth, it’s bound to face many attacks from predators and competitors.

But it will repel them with its wide range of protective enzymes and compounds to keep the mushroom safe.

Preparing for Baby Mushroom

The mycelium gathers all the nutrients needed to continue the mushroom’s life cycle. It will wait until it's exposed to specific conditions, like particular light, humidity, and temperature levels, to start the process of creating a mushroom.

It will tightly wind itself, twisting and compacting into what’s referred to as a hyphal knot. These the hyphal knots grow into tiny dots called primordium which will then grow and emerge from the soil surface as pins. These pins mark the beginning of a young (or baby) mushroom.

primordia in a petri dish
The mycelium in this petri dish has knotted together and formed a number of primordia. Under the right conditions, these little dots will grow into tiny baby mushrooms call pins.

You can tell the pin stage apart from earlier stages because pins basically look like minuscule mushrooms. In the case of button mushrooms (Agaricus bisporus) the pins will be 4–10 mm in diameter and show a distinct ‘waist’, separating the developing cap and stem tissues (1).

These pins will grow in size and develop the final features of a mature mushroom (fruiting body).

mushroom pins emerging from soil
You can think of pins as the baby mushroom stage. In the case of these button mushrooms (Agaricus bisporus) the pins will be 4–10 mm in diameter and show a distinct ‘waist’, separating the developing cap and stem tissues

Unfortunately, many products that label themselves as mushroom supplements contain a large portion of mycelium and substrate matter (typically grain when growing mycelium commercially). They may not include any mushrooms at all.

This misrepresents what the customer is purchasing, causes confusion, and compromises the efficacy of the product.

The only genuine mushroom supplements are those made using 100% mushrooms, which develop in the final stage of the mushroom life cycle.

Stage 4 - Full Grown Mushroom Develops

While the primordium continues to develop, the mushroom releases enzymes and makes the most out of the nutrients available for its growth and maturity.

However, not all the pinheads (baby mushrooms) will grow to maturity. Out of the thousands of primordia, the growing organism will select only a few with the best chances of maturing into healthy mushrooms.

The mushroom then channels all of its nutrients and energy to develop the selected primordia to full maturity.

The fully grown mushroom will have all the structures necessary for it to produce and release spores.

A mushroom’s life cycle is complete when it releases spores into the environment for propagation.

And just like everything else in nature, the cycle begins again, with the new generation of mushrooms ready to begin developing.

Fully grown shiitake mushroom
A fully mature shiitake mushroom at the Real Mushrooms farm is ready for picking to be made into high-quality supplements.

Why Should You Care About the Mushroom Life Cycle?

Understanding the life cycle of a mushroom will tell you more about how and when to consume it, and what portions of it are the most rich nutrients.

The mushroom (fruiting body) contains more active beneficial compounds, like beta-glucans, compared to any other stage in this fungal lifecycle.

It’s incredibly rich in polysaccharides like beta-glucans, antioxidants, and triterpenoids. These are the compounds largely responsible for the health benefits of functional mushrooms, such as supporting the immune system.

That’s why it’s crucial to invest in mushroom supplements with high concentrations of fungal beta-glucans in particular. A product whose label indicates the beta-glucan content per serving and shows that it contains fruiting bodies and not mycelium will generally be a reliable option.

The Difference is Real: Mushrooms vs Mycelium

Many supplement products sold in North America contain mycelium grown on grain instead of actual mushrooms. Though, sometimes this is not clear from the label unless you look closely at the ingredient list.

Check out the differences between supplements made from the mushrooms versus mycelium grown on grain in the table below:

Mushrooms vs mycelium supplement table

At Real Mushrooms, we understand these differences and the impact a mushroom supplement can have on a user.

That’s why we strive to create the highest quality supplements with only the mushroom and no mycelium or residual substrate.

All of our mushroom supplements include a fact section, where we list all ingredients used, the amount of beta-glucan per serving, among other relevant information (as shown below).

fact section of Real Mushroom supplements and explained
To make sure you’re getting a high-quality mushroom supplement, make sure the ingredients include only mushroom extracts and no mycelium. It’s even better if the label states the beta-glucan content so you can tell the potency.

We’re determined to provide you with only the best quality supplements containing all the benefits of real health-promoting mushrooms.

Browse our collection of 100% real mushroom extracts, all of which are sourced from our organic mountain farms.

And they’re not just great for your health; your pets can benefit from mushrooms too. Check out our mushrooms for pets supplements for your furry loved ones.

"... not all mushrooms are created equal and I have found this company to be one of the best! I recommend their capsules to all of my clients."
- Kathy, Real Mushrooms Verified Buyer

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  1. Baars JJP, Scholtmeijer K, Sonnenberg ASM, van Peer A. Critical Factors Involved in Primordia Building in Agaricus bisporus: A Review. Molecules. 2020; 25(13):2984.

Real Mushrooms is the premier provider of organic mushroom extracts, verified for the beneficial medicinal compounds like beta-glucans and free from starchy fillers like grains. With over 40 years of mushroom growing experience, Real Mushrooms prides itself on providing a transparent source of functional mushrooms that you can trust. All the information provided on our blog has been reviewed by our science and medical team.

Disclaimer: The information or products mentioned in this article are provided as information resources only, and are not to be used or relied on to diagnose, treat, cure, or prevent any disease. This information does not create any patient-doctor relationship, and should not be used as a substitute for professional diagnosis and treatment. The information is intended for health care professionals only. The statements made in this article have not been evaluated by the Food and Drug Administration. Any products mentioned are not intended to diagnose, treat, cure, or prevent any disease. The information in this article is intended for educational purposes. The information is not intended to replace medical advice offered by licensed medical physicians. Please consult your doctor or health practitioner for any medical advice.