What Are Magic Mushrooms? Science, Species, and How They Work

Magic mushrooms are fungi that naturally produce the psychedelic compound psilocybin. When you eat them, your body converts psilocybin into psilocin. Psilocin then binds to serotonin receptors in the brain – especially the 5-HT2A receptor – and temporarily changes how you perceive the world, process emotions, and experience your sense of self. Scientists have identified over 200 species of psilocybin-containing mushrooms, spread across several genera. The most well-known is Psilocybe cubensis, which is the species you will find in most grow kits today.

What Is a Mushroom?

A mushroom is the fruiting body of a fungus – the visible part that grows above ground. Think of it like an apple on a tree. The apple is not the tree itself; it is the structure the tree builds to spread its seeds. Similarly, the mushroom is not the whole fungus. It is the structure the fungus builds to spread its spores.

The main body of any fungus is the mycelium: a vast network of thin, thread-like cells called hyphae. The mycelium lives hidden underground, inside wood, or within other organic material. It can spread across enormous areas. In fact, some fungal networks are among the largest living organisms on Earth.

When conditions are right – enough moisture, the right temperature, and available nutrients – the mycelium sends up a fruiting body: the mushroom. A typical mushroom has three main parts:

When a mushroom first appears, it is tiny. At this stage it is called a pin. Pins can grow into full-sized mushrooms remarkably fast – sometimes within 24–48 hours. If you have a mushroom grow kit, you can watch this process unfold with your own eyes. However, not every pin develops successfully. If a pin stops growing and darkens, it is called an abort.

Four Categories of Mushrooms

There are thousands of mushroom species in the world. To keep things simple, they can be grouped into four broad categories based on their effects on humans:

These categories can overlap. For instance, lion's mane is both edible and medicinal. Some Amanita species are psychoactive but also toxic. However, magic mushrooms are unique because they contain psilocybin – a compound that specifically interacts with serotonin receptors to produce temporary changes in consciousness. No edible, medicinal, or poisonous mushroom does this.

What Makes Magic Mushrooms "Magic"?

The "magic" in magic mushrooms comes from psilocybin and its close relative psilocin. These are naturally occurring psychedelic compounds classified as tryptamines. Here is how they work:

The key event is step 4. Psilocin has a molecular shape very similar to serotonin, so it fits into the same receptors. This disrupts the brain's default mode network (DMN) – the network responsible for your everyday sense of self, habitual thought patterns, and internal monologue. When the DMN quiets down, the brain becomes more flexible. Regions that do not normally communicate start exchanging information. This is what produces the altered states of consciousness people experience during a magic mushroom trip.

The effects typically begin 20–60 minutes after eating and last 4–6 hours. They can range from subtle mood enhancement at low doses to profound visual, emotional, and spiritual experiences at higher doses. For a detailed breakdown of what each dose level feels like, see our trip levels guide.

How Many Species Exist?

Scientists have identified over 200 species of psilocybin-containing mushrooms. A comprehensive review found them spread across several genera:

By far the most popular species for cultivation and consumption is Psilocybe cubensis. It grows well in warm, humid conditions and has dozens of named varieties – such as Golden Teacher, B+, McKennaii, and Colombian. Each variety has slightly different characteristics in terms of potency, appearance, and growth behaviour. All of our grow kits feature P. cubensis varieties.

A 2024 study in PNAS used genomic analysis to map the evolutionary relationships within the Psilocybe genus. The study revealed that psilocybin production actually evolved independently at least twice – not once, as previously thought. In addition, genetic research shows that the psilocybin gene cluster spread between unrelated species through horizontal gene transfer – a rare event where genes jump between organisms rather than being inherited from parent to offspring.

Why Do Mushrooms Produce Psilocybin?

This is one of the most fascinating questions in mycology. Fungi do not have brains. They do not benefit from a psychedelic experience. So why would a mushroom produce a compound that alters consciousness?

The leading hypothesis is chemical defence. Many insects, slugs, and other small animals eat mushrooms. Psilocybin closely mimics serotonin, which regulates behaviour in nearly all animals with a nervous system. When a slug or insect eats a psilocybin mushroom, the compound interferes with its neural signalling. As a result, the animal becomes confused or disoriented. It then learns to avoid that mushroom in the future. This gives psilocybin-producing fungi a survival advantage.

A 2025 study published in Science confirmed this "chemical defence" theory and added a fascinating twist. The researchers found that psilocybin evolved independently in two completely separate fungal lineages – using different enzymes and different biochemical pathways. This convergent evolution suggests that psilocybin production offers a strong survival benefit. In other words, nature invented psilocybin twice because it works.

There is also a competing idea. Some scientists suggest that psilocybin may attract certain animals – like humans or other large mammals – that eat the mushrooms, carry the spores in their gut, and deposit them far from the parent fungus. In this view, psilocybin is not just a deterrent. It could also be a lure that helps the fungus spread to new territory.

Their Role in the Wild

Most psilocybin mushrooms are saprotrophs. This means they feed on dead or decaying organic matter. They do not attack living plants or animals. Instead, they break down dead wood, leaf litter, and animal dung into simpler nutrients that other organisms can use. In this way, magic mushrooms play an essential role in the ecosystem as recyclers.

Depending on the species, magic mushrooms grow in different habitats:

A 2024 Australian study confirmed that wood-loving Psilocybe species are saprotrophic invaders that colonise new habitats by decomposing wood-chip mulch. Therefore, where humans introduce wood mulch in gardens and parks, these mushrooms sometimes follow.

Magic Mushrooms vs. Magic Truffles

If you have explored our shop, you will have noticed that we sell both magic mushroom grow kits and magic truffles. Here is how they relate:

Magic truffles are not true truffles (like the expensive culinary truffle). Instead, they are sclerotia – hardened clumps of mycelium that form underground as a food reserve for the fungus. When conditions above ground are too dry, cold, or hostile for a mushroom to fruit, the fungus stores nutrients in a sclerotium instead. Both the mushroom and the sclerotium are parts of the same organism. Both contain psilocybin and psilocin.

In the Netherlands, magic truffles are legally sold and consumed. This is why our magic truffle range is one of our most popular product categories. For a deeper dive, read our full guide on what magic truffles are.

A Brief History of Human Use

Humans have consumed psilocybin mushrooms for thousands of years. Rock art and mushroom-shaped stone sculptures found in Central America, North Africa, and Europe suggest that ancient cultures used these fungi in spiritual and healing rituals. The Aztecs called them teonanácatl – meaning "flesh of the gods."

In the 20th century, Western science rediscovered magic mushrooms when ethnomycologist R. Gordon Wasson participated in a Mazatec mushroom ceremony in Mexico in 1957. Albert Hofmann (the chemist who also discovered LSD) subsequently isolated and identified psilocybin. For a deeper look at these traditions, see our article on shamanism and magic mushrooms.

Today, psilocybin is the subject of a global research renaissance. Clinical trials are exploring its potential to treat depression, PTSD, anxiety, and addiction. Institutions like Johns Hopkins, Imperial College London, and the University of Zurich are leading this work.

What Do Magic Mushrooms Do?

The effects of magic mushrooms depend on the dose, the species, your mindset, and your environment. Here is a general overview:

Your set and setting play a huge role in shaping your experience. "Set" is your mindset going in. "Setting" is the physical and social environment. Together, they can make the difference between a difficult experience and a profoundly positive one. For practical preparation tips, read our 9 steps to a safe magic mushroom trip.

Some people also choose to bring more structure to their journey by turning their trip into a ceremony. Others combine magic mushrooms with meditation to deepen the inward experience. Having a trip sitter present is also recommended, especially for beginners.