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

By June 2, 2022June 17th, 2022No Comments
Mushroom Anatomy: A Deep Dive Into the Parts of a Mushroom

Describing mushroom anatomy is not always easy because there are so many unique types of mushrooms. Mushrooms are not a plant or an animal, but a species all their own that belongs to the fungi kingdom. We know they’re living, so they need to consume energy and reproduce, but how does their anatomy allow them to do it?

There’s much more to mushroom anatomy than what meets the eye – quite literally. The visible mushroom (fruiting body) that grows from the ground or tree shows only a small part of the fungi’s anatomy. Beneath the surface, they have minuscule hyphae that make up mycelial networks that can spread out for miles.

If you’re curious about the makeup of a mushroom and wonder what fungal parts contain health-supporting properties, this guide has you covered. Let’s take a look at the parts that make up a mushroom’s anatomy, their functions, and health-supporting properties.

What’s in this article:

  1. What is the Fruiting Body of a Fungus?
  2. What is Mycelium?
  3. Medicinal Parts of Mushrooms

Labeled Mushroom Anatomy Diagrams

We go into the details of the structures of mushrooms in this article. However, if you’d like to wrap your head around the basics of mushroom anatomy at a glance, here are some helpful diagrams we approve of:

What is the Fruiting Body of a Fungus?

When you think of mushroom anatomy, the image that comes to your mind is likely the mushroom itself, also known as the fruiting body, or the part that you eat. The reality is, that there is much more to mushroom anatomy beneath the surface. Just as an apple is to a tree, the mushroom is the fruit of these fungal organisms. The term “mushroom” is interchangeable with the term “fruiting body.” The mushroom is the “fruit” of the fungus.

For most common fungi, the mushroom, which can also be called a sporophore, is made up of a cap and stem. It only exists for a short period and its primary evolutionary function is to spread spores at the end of the mushroom’s life cycle. Some of these spores will go on to produce new mushrooms and restart the cycle (1,2).

Mushrooms have 4 primary structures:

  1. Cap
  2. Cap Underside
  3. Spores
  4. Stem

Read on to learn about the functions, features, and variations of each of these structures.

Mushroom Caps

Mushrooms can come in a vast variety of shapes, sizes, and colors. The common mushroom anatomy appearance that most are familiar with consists of a cap and stem.

Mushroom Cap Shapes

The mushroom cap, also known as the pileus, is the structure on top of the mushroom that holds the gills or pores. They come in different shapes, sizes and textures. They can be smooth or covered with scales or teeth.

The shape of a mushroom cap is unique from species to species, which is helpful for identification. The familiar mushroom anatomy shape is somewhat spherical, like an umbrella. In the early stages of development, it can be evenly convex and then become more expanded as it matures. Some mushroom cap shapes include:

  • Conical
  • Campanulate (Bell-Shaped)
  • Ovate
  • Flat (plane)
  • Infundibuliform (deeply depressed)
  • Convex
  • Depressed
  • Umbilicate (small depression)
  • Umbonate (knobbed)
Mushroom Cap Shapes DIagram
The 9 types of mushroom cap shapes.

But many mushrooms, like some of our favorite healthy mushrooms, have a look all their own. Take lion’s mane mushrooms for instance. They are a tooth fungus, meaning instead of a spherical dome cap, they have “teeth” or shaggy hair-like structures that hang down around the mushroom and produce spores.

Mushroom Cap Scales

Scales are part of a mushroom’s anatomy that form hard-shelled protection for fungi. They often appear in various shapes and sizes, contributing to the unique physical appearance of mushrooms in the wild.

Scaly caps can be useful in the identification of mushrooms as numerous species have them. Scales typically appear on the cap, but can also be present on the stem. They often appear as the result of cracking as the cap expands during growth, but can also be seen when immature.

Mushroom scales
Scales on the caps of the shaggy scalycap mushroom (left) and the parasol mushroom (right).

Mushroom Cap Undersides

Beneath the cap of many common mushrooms, you’ll find either gills (also known as lamellae), pores, ridges, or teeth. These are the parts of a mushroom’s anatomy that produce and release spores (1).

These parts of a mushroom are important for identification because many species look similar based on the appearance of their cap. The underside of a mushroom is sometimes the only way to distinguish between edible mushrooms and poisonous ones.

Underside of Mushroom Undersides - Gills, Pores, Ridges, Teeth
The underside of a mushroom can have one of 4 types of structures: gills, teeth, ridges, or pores. Source.

Mushroom Gills

The mushroom gill is a small, thin-walled structure that surrounds the stem of the mushroom. It has an opening on one side and is usually found in clusters around the stem of mushrooms.

The gills are composed of two layers, the lamellae that reach from the stem to the edge, and the lamellulae that are shorter gills that don’t reach the stem. Not all mushrooms possess lamellulae (3).

Gills can have many distinct characteristics that make the mushroom identifiable. Some include:

  • Shape
  • Width
  • Spacing
  • Depth
  • Color
Mushroom Gills
An example of wavy mushroom gills versus straight gills.

Gills can be attached to the stem or free, they can also have various forking or branching patterns.

Forking gills can be deceptive. For instance, chanterelle mushrooms have structures that look similar to forked gills but these are actually false gills. These structures often appear as smooth ridges underneath the cap. True gills, on the other hand, are separate parts of a mushroom that can be picked off. When it comes to identification, knowing the difference between true gills and false gills can be very helpful.

Mushroom Ridges

There are mushrooms whose undersides look deceptively similar to gills. As mentioned in the previous section, these false gills are actually ridges.

One test for figuring out whether a mushroom has ridges or gills is to try and detach the feature from the mushroom. If you can easily pull a segment of the underside’s feature away from the cap, you most likely have a gilled mushroom. If the feature seems to mold into the mushroom itself and cannot be easily detached from it, you most likely have ridges (false gills).

Chanterelle mushrooms and pig’s ears mushrooms (Gomphus clavatus) are examples that have forked ridges on the underside of the cap.

Mushroom ridges
The chanterelle mushroom (left) and pig’s ear mushroom (right) have ridges under their caps. These look deceptively like gills but cannot easily be plucked from the cap.

Mushroom Pores

Other types of mushrooms have pores instead of gills. Like gills, pores produce spores, but they appear as small, sponge-like holes instead of thin blades.

The little holes lead to tubes inside the cap. As spores mature, they eventually fall from the tubes out of holes and into their environment. Similar to gills, these mushroom parts are helpful in indicating the species. Color, size, pattern, and quantity, are all pore traits that are useful in indicating the species.

Mushroom pores - Bolete - Polypore
The pores of a bolete mushroom are what hold the mushroom spores.

Boletes and polypores are two common types of mushrooms that are known to have pores.

Porcini is a well-known edible mushroom that is a bolete. Although, not all boletes are as tasty as the porcini, or even safe to consume.

Polypores, on the other hand, are almost always found growing on rotting wood. Turkey tail is an example of a polypore. They are a type of healthy mushroom that grow flat off the sides of decaying wood and fan out as they mature. As they grow they develop rings of different shades of brown and white that make them resemble a turkey’s tail.

Like the turkey tail, other polypores are usually shelf-shaped and non-poisonous.

Mushroom Teeth

As we mentioned earlier, some mushrooms have developed some interesting traits to disperse their spores. Some of these traits include long, thin, shaggy growths that hang from the mushroom cap called teeth. The teeth of a mushroom can be a few millimeters to a few centimeters long.

These teeth, also known as spines, make it easier to narrow down the species of mushroom because they’re less frequent compared to gills or spores. The hedgehog mushroom is a common mushroom that has short teeth that hang from the underside of its cap. As noted before, lion’s mane mushrooms (also called bearded tooth mushrooms) also have teeth, but theirs grow from its stem where other mushrooms would have a cap.

Mushroom teeth - lion's mane
The “teeth” of a lion’s mane mushroom.

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Mushroom Spores

The microscopic reproductive cells that make it possible for fungi to replicate are called spores. Just like plants need seeds to reproduce, mushrooms need spores. If the visible mushroom is the “fruit”, the spore is the “seed”. Spores are found under the mushroom cap, within the gills or pores (1).

The Function of Mushroom Spores

Spores are unique in that they are able to form into a new mushroom without needing to fuse into another reproductive cell. There are no male or female spores because mushrooms typically reproduce asexually. Although, they do have the ability to reproduce sexually when two compatible mycelia clumps fuse (2).

Mushrooms can release trillions of spores every day, but they don’t produce spores all the time. They will only create spores if conditions are ideal. Mushrooms need ample nutrients and water to produce spores and carry out their life cycle (2).

Mushroom spores image - microscope
A close look at the microscopic spores of a puffball mushroom.

How Mushroom Spores Get Dispersed

(Include interesting examples such as the Lycoperdon and stinkhorn’s adaptations, such as smell, slime etc. to encourage maximum spore dispersal. For example, the veiled lady’s “netting.”)

Mushrooms have developed many creative and fascinating methods for dispersing their spores. Some simply drop or eject their spores from their gills, pores, or teeth, and allow critters, water, or a light breeze to carry them off to their new destination. If they’re lucky, they’ll fall onto the fertile ground and restart the mushroom life cycle (4,5).

Some have evolved in interesting ways to encourage maximum spore dispersal. The Lycoperdon perlatum, also known as the common puffball, is one of them. They have one large pore at the top of their cap through which spores are released. When something bumps into them, like raindrops or small animals, a large number of spores are ejected in a smoke-like cloud (4,5). Fun fact: Lycoperdon translates to “wolf farts” in greek.

The stinkhorn is a mushroom that works with insects to disperse their spores. This mushroom has a very pungent smell that attracts flies, ants, and other bugs. It also secretes a sticky slime that contains their spores. So when insects crawl all over them, they inevitably get the slimy spores stuck to them, and they carry them off to a new destination (6).

Stinkhorn mushroom spores - insects
The stinkhorn mushroom smells of decay and therefore attracts insects. The spores stick to the insects and get dispersed as they roam their environment.

Chaga is a fungi that grows on birch trees and has no spores. Instead, its spores develop underneath the trees bark and accumulates around the chaga conk as the tree dies. From there, the spores disperse into the air to find new trees to grow in.

Mushroom Releasing Spores

Gorgeous shot of Amanita Muscaria releasing its spores.

As seen on reddit: https://www.reddit.com/r/mycology/comments/nj98hl/amanita_muscaria_releasing_spores/

Posted by Real Mushrooms on Monday, May 24, 2021

The movement of wind, animals, and insects are all responsible for helping to disperse the millions of spores produced by any single mushroom.

Mushroom Stems

A mushroom stem is the stalk of a mushroom, it’s also sometimes referred to as the stipe. Its primary function is to support the cap and the spores it contains. This part of a mushroom is long, sturdy, and shaped like a cylinder. The stem usually has an annulus or vulva attached to it. These parts of a mushroom protect the spores during development (7).

Mushroom Ring (Annulus)

When some mushrooms are in the early stages of growth, they develop a partial veil that surrounds and protects the underside of the cap. As the mushroom matures and expands, its partial veil breaks away from the cap and is left hanging around the stem. This hanging part is the annulus, or mushroom ring (7).

Mushroom annulus
The ring at the top of a mushroom stem is called an annulus. It is formed when the partial veil breaks away from the cap.

Mushroom Vulva

Other types of mushrooms also have a universal veil that encapsulates the entire mushroom during early development. As it matures, the universal veil breaks off. The pieces of the universal veil that remain attached to the bottom of the stem are the vulva (7).

Fragments of the universal veil often stick to the cap in patches, resembling warts. For instance, Amanita Muscaria’s white spots are fragments of its universal veil.

Usually, mushrooms with a universal veil also have a partial veil. Since both parts of a mushroom are present, they will have a vulva and an annulus.

Watch this time-lapse to see the Amanita Muscaria (Fly Agaric) emerge from its universal veil and grow into a bright red mushroom. The remains of its veil form the vulva at the stem’s base.

What is Mycelium?

Mycelium is an unseen but fascinating part of mushroom anatomy. They are made up of small networks of threads called hyphae. The primary function of mycelium is to collect nutrients and water.

Environmental conditions need to be just right in order for the mycelium to produce a mushroom. Some mycelium can live for hundreds, even thousands of years without producing a mushroom. All mushrooms come from mycelium, but not all mycelium will produce mushrooms (1,2).

Do Mushrooms Have Roots?

Mushrooms are not plants and don’t have roots like most plants do. However, mycelium is often referred to as the mushroom’s root system because it behaves similarly.

Like plant roots, mycelium’s role is to collect nutrients and water and keep the mushroom anchored to the earth. But mycelium is different in that it secretes enzymes to break down and absorb surrounding dead, organic matter. This process of decomposition is what makes fungi so crucial for the health of our environment (2).

mycelium on wood
The white mycelium filaments of these mushrooms can be seen infiltrating the wood below them. Mycelium is responsible for the decomposition of organic matter that will nourish the growth of plants and trees.

Mushroom Hyphae

The smaller, individual branching units that make mycelium are called hyphae.

This part of a mushroom begins to develop when a spore is carried to the fertile ground where it can germinate and shoot out tiny, filamentous hyphae strands (1,2).

These hyphae strands grow as they collect food and nutrients, and eventually contact and combine with other hyphae. The collective unit of these ever-growing networks of hyphae is referred to as mycelium (2).

Medicinal Parts of Mushrooms

Each part of a mushroom’s anatomy is equally important for supporting the life cycle of a fungus. But is each component equal when it comes to medicinal value? Let’s take a look.

Medicinal mushrooms such as reishi, lion’s mane, cordyceps, turkey tail, and chaga contain a variety of nutrients and compounds that can be beneficial in supporting your health. Most of their key medicinal benefits come from their polysaccharide content, particularly beta-glucans. Studies show that beta-glucans can help balance your body’s immune response, support healthy blood sugar levels, and balance energy levels (8,9).

Beta-Glucans in Mushrooms Versus Mycelium

However, data suggests that the abundance of beta-glucans is not the same throughout all these different stages and parts of these fungi. One study showed that the shiitake mushroom can have up to about twice as many beta-glucans as the mycelium (10). What was also interesting in this study, is that the cap and stem of the mushroom contain different levels of beta-glucans.

The chart below shows the significant difference between mushroom (fruiting body), pure mycelium, and myceliated grain in a study of Cordyceps beta-glucan content.

Percentage of Beta-Glucans in Cordyceps Mushroom VS Mycelium

mushroom versus mycelium
Analytical data courtesy of Nammex™

Knowing the beta-glucan content is necessary when choosing a mushroom supplement. Since most of a mushroom’s health benefits come from their beta-glucan content, it would be ideal for mushroom supplements to be made from only the mushroom (fruiting body).

There is an ongoing problem in the mushroom supplement industry where manufacturers use both the mushroom and mycelium, or only the mycelium. In these cases, the grain substrate the mycelium grows in is not separated out and ends up in the final product. The result is a supplement that has little to no actual mushrooms in it. Rather, such products contain unnecessary starch-based filler rather than high concentrations of the desirable health-supporting compounds like beta-glucans.

mushroom supplement beta-glucans
A high-quality mushroom supplement will indicate the percentage of beta-glucans on the label.

To be certain that you get the most high-quality mushroom supplement, look for extracts made from only the mushroom (fruiting body). The label of the product should make it clear that it is made using only the mushroom. Ideally, the label will also indicate the percentage of beta-glucans.

Real Mushrooms use only mushrooms in our powder extracts. Our product labels show exactly what ingredients we include, including the beta-glucan content. So you know that you’re only consuming the mushroom and therefore are getting the most health-supporting benefits as possible.

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Learn More About Mushroom Anatomy and Compounds:

References

  1. Mattos-Shipley, K. M. J. (2011). Fox, S. , & Bell, A. (2016). urban geography and protest mobilization … The good, the bad and the tasty: The many roles of mushrooms. Retrieved April 27, 2022, from https://research-information.bris.ac.uk/ws/portalfiles/portal/62796807/Urban_geography_protest_mobilization_in_Africa_Final_Draft_pdf
  2. Encyclopædia Britannica, inc. (n.d.). Form and function of fungi. Encyclopædia Britannica. Retrieved April 27, 2022, from https://www.britannica.com/science/fungus/Form-and-function-of-fungi
  3. Fischer, M. W. F., & Money, N. P. (2010, January). Why mushrooms form gills: Efficiency of the LAMELLATE morphology. Fungal biology. Retrieved April 27, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2891949/
  4. Fischer, M. W. F., Stolze-Rybczynski, J. L., Cui, Y., & Money, N. P. (2010, August). How far and how fast can mushroom spores fly? physical limits on ballistospore size and discharge distance in the Basidiomycota. Fungal biology. Retrieved April 27, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2936274/
  5. Hassett, M. O., Fischer, M. W. F., & Money, N. P. (n.d.). Mushrooms as rainmakers: How spores act as nuclei for Raindrops. PLOS ONE. Retrieved April 27, 2022, from https://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0140407
  6. Tang, X., Mi, F., Zhang, Y., He, X., Cao, Y., Wang, P., Liu, C., Yang, D., Dong, J., Zhang, K., & Xu, J. (2015, May 18). Diversity, population genetics, and evolution of macrofungi associated with animals. Mycology. Retrieved April 27, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6106070/
  7. Encyclopædia Britannica, inc. (n.d.). Mushroom summary. Encyclopædia Britannica. Retrieved April 27, 2022, from https://www.britannica.com/summary/mushroom
  8. E;, A. D. K. A. D. J. K. (n.d.). Effects of beta-glucans on the immune system. Medicina (Kaunas, Lithuania). Retrieved April 27, 2022, from https://pubmed.ncbi.nlm.nih.gov/17895634/
  9. El Khoury, D., Cuda, C., Luhovyy, B. L., & Anderson, G. H. (2012). Beta glucan: Health benefits in obesity and metabolic syndrome. Journal of nutrition and metabolism. Retrieved April 27, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3236515/
  10. Bak, W. C., Park, J. H., Park, Y. A., & Ka, K. H. (2014, September). Determination of glucan contents in the fruiting bodies and mycelia of Lentinula edodes cultivars. Mycobiology. Retrieved April 27, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4206800/#:~:text=The%20%CE%B2%2Dglucan%20content%20in%20mycelia%20ranged%20from%2015.59%20%C2%B1,%25%20to%2027.09%20%C2%B1%202.11%25

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