Mushroom Anatomy 101: More than Caps + Stems (2024)

Mushrooms are the fruiting body of fungi, and come in a variety of shapes, sizes, and colors. While the exact anatomy of a mushroom can vary depending on the species, most mushrooms share a similar basic structure.

The Basics of Mushroom Anatomy

The cap of a mushroom is the rounded, often umbrella-shaped top of the fruiting body. The cap is supported by a stem, which is typically cylindrical in shape and can vary in length and thickness. The underside of the cap is lined with gills, which are thin, ribbed structures that radiate out from the stem. The gills contain the spores of the mushroom, which are dispersed when the cap is disturbed or when the mushroom is mature.

Some species of mushrooms have pores instead of gills. Pore-bearing mushrooms have a flat or slightly convex cap with a spongy underside covered in tiny holes. The spores of these mushrooms are released through the pores rather than the gills.

Understanding Mycelium

The mycelium is the part of the fungus that grows underground or within the substrate where the mushroom is growing. The mycelium is a network of thin, branching filaments called hyphae. The hyphae absorb nutrients from the substrate, breaking down organic matter and converting it into a form that the fungus can use for growth. When conditions are right, the mycelium produces a fruiting body, which is the visible part of the mushroom.

Mushrooms are also classified as either saprotrophic or mycorrhizal. Saprotrophic mushrooms obtain their nutrients from dead or decaying organic matter, while mycorrhizal mushrooms have a symbiotic relationship with the roots of plants. Mycorrhizal fungi help plants absorb water and nutrients from the soil, while the plants provide the fungus with carbohydrates.

In addition to their basic structure, mushrooms can also have a variety of other features, such as rings or scales on the stem, a veil that covers the gills when the mushroom is young, or a partial veil that leaves a ring-like structure on the stem as the cap expands. These features can be used to help identify different species of mushrooms.

Michelle Wheeler

Mushroom Anatomy 101: More than Caps + Stems (2024)

FAQs

What is the cap of a mushroom anatomy? ›

The cap of a mushroom is the rounded, often umbrella-shaped top of the fruiting body. The cap is supported by a stem, which is typically cylindrical in shape and can vary in length and thickness. The underside of the cap is lined with gills, which are thin, ribbed structures that radiate out from the stem.

What does the stalk of a mushroom do? ›

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.

What is the organ of the mushroom? ›

Mushrooms are fungi and taxonomically are close relatives of molds. In fact, their bodies are made of hyphae similar to molds. What we call the mushroom is the organ which creates the organism's spores. When the time is right, this organ grows to a size that is visible to the naked eye.

What is the underside of a mushroom called? ›

In mycology, a lamella ( pl. : lamellae), or gill, is a papery hymenophore rib under the cap of some mushroom species, most often agarics. The gills are used by the mushrooms as a means of spore dispersal, and are important for species identification.

What are large mushroom caps called? ›

Creminis are sometimes called "baby bellas" because portabellas, the mature form Agaricus bisporus, are much bigger. Portabella mushroom caps can be as big as 6 inches in diameter.

What is a mushroom cap hump called? ›

An umbo is a softly curved bump in a flat cap. A cap with an umbo is said to be umbonate, as in the two larger mushrooms at the left. The two small mushrooms at the right have a central bump on a convex pileus, and are said to be campanulate, or bell-shaped.

Which part of mushroom is not edible? ›

Avoid mushrooms with white gills, a skirt or ring on the stem and a bulbous or sack like base called a volva. You may be missing out on some good edible fungi but it means you will be avoiding the deadly members of the Amanita family. Avoid mushrooms with red on the cap or stem.

Can you eat the stalk of a mushroom? ›

Get ready to relish the full mushroom experience! The stems of white button, crimini, portabella, oyster, and king oyster mushrooms are entirely edible and bursting with savoury goodness. These tasty stems add texture and depth to your dishes, allowing you to enjoy the whole mushroom with every delightful bite.

What are the girls on the underside of a mushroom used for? ›

The sole purpose of mushroom gills, also known as lamellae, is to produce and release spores. When millions of spores are dropped from the gills, they are often carried away by wind currents, ensuring their wide distribution.

What part of the body does mushroom heal? ›

Boost immune system

Mushrooms contain high amounts of selenium, vitamin D, and vitamin B6. Selenium can help prevent cell damage in our bodies, vitamin D helps with cell growth, and vitamin B6 helps our bodies form red blood cells. All of these nutrients in mushrooms help to maintain a healthy immune system.

Is mushroom a plant or meat? ›

Mushrooms aren't plants and therefore cannot be vegetables. They aren't animals either and therefore cannot be considered meat. They are the fruiting bodies of fungi, which constitute a whole different kingdom of organisms, separate from both animals and plants.

What is the anatomy structure of a mushroom? ›

Mushroom anatomy consists of the fruiting body—the mushroom spores, stem, cap, ring, and gills - and although they are mycelium and mushrooms are fungal, the mycelium is not part of the mushroom anatomy, it's only part of the life cycle of some mushrooms.

What is the ring on a mushroom called? ›

An annulus is the ring-like or collar-like structure sometimes found on the stipe of some species of mushrooms. The annulus represents the remnants of the partial veil, after it has ruptured to expose the gills or other spore-producing surface.

What is the black thing under mushroom? ›

The only black part of a mushroom is the spores. And in my opinion (only an opinion) this is where most of the flavour and nutrition is. It's water, cook them until all the water has evaporated for a much more intense flavour.

Why doesn't a mushroom have green leaves? ›

Mushrooms are a lot like plants, but they lack chlorophyll and have to take nutrients from other materials. Mushrooms are neither plants nor animals.

What are mushroom caps? ›

The pileus is the technical name for the cap, or cap-like part, of a basidiocarp or ascocarp (fungal fruiting body) that supports a spore-bearing surface, the hymenium.

What is the anatomy of the death cap mushroom? ›

Gills/spores: underneath the cap, the gills are broad and free, pure white turning cream or even slightly pink as they age. The spores are smooth and are elliptical in shape and its spore print is white. Stipe (stalk): the stem is off-white, 7–15cm high with a floppy ring.

What is a mushroom with a spongy cap? ›

A bolete, Boletus edulis, showing the solid looking, spongy bottom surface, which is the defining characteristic of boletes. "Bolete" is the English common name for fungus species whose mushroom caps have this appearance. The boletes are classified in the order Boletales.

Do all fungi have caps? ›

Some wild mushrooms look structurally similar to the mushrooms available in many grocery stores, with a stem and a cap with gills underneath. Others can have a sponge-like surface beneath the cap. Some don't have caps at all and look like they would be more at home in a colorful coral reef than in the forest!

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