3 POISONOUS Mushrooms found in Wyoming! (2024)

What kinds of poisonous mushrooms are found in Wyoming?

Types of poisonous mushrooms in Wyoming

If you spend time outside, you’ve probably asked this question at least once. Poisonous mushrooms definitely have an infamous reputation.

Below, I have listed common poisonous mushrooms you can expect to find in Wyoming. But in NO WAY is this a complete listing of dangerous fungi. There are thousands of mushrooms in North America, so reviewing and writing about every toxic species is nearly impossible.

IMPORTANT: I can’t stress enough that you should NEVER eat a mushroom you find. As you will see below, there are many poisonous types, and some species will kill you. So stay safe, and don’t eat any wild mushrooms unless you are with a mycologist (mushroom expert)!

3 Poisonous MUSHROOMS in Wyoming:


#1. Fly Agaric

  • Amanita muscaria

Types of poisonous mushrooms in Wyoming

  • The caps are scarlet or dark orange with white, wart-like spots, which may wash off as mushrooms mature.
  • The stalk is white and brittle with shaggy rings of scales, a bulbous base, a cup-like veil near the base, and a skirt-like veil near the top.

The Fly Agaric is arguably the most iconic poisonous mushroom in Wyoming.

This colorful toadstool has an equally colorful history. The name “fly” may come from the mushroom’s historical use as an insecticide in parts of Europe. It contains ibotenic acid, which attracts and kills flies.

However, some people believe the name refers to the hallucinations that result from its consumption. This mushroom once saw widespread use in religious ceremonies.

Through the ages, this mushroom has also been wrapped up in fairytales and folklore. You may remember it as the mushroom Alice is given to eat in Alice in Wonderland or as the mushrooms in the Super Mario Bros games.

Fly Agarics grow in symbiotic associations with trees and can be found in delicious and coniferous forests in temperate and boreal regions.

While it is poisonous, deaths due to consuming Fly Agaric are rare.


#2. False Morel

  • Gyromitra esculenta

Types of poisonous mushrooms in Wyoming

  • The caps are brain-like, red-brown, wrinkled, and usually wider than tall.
  • They usually have more solid stems with small air pockets than true morels, which have hollow stems.

The False Morel is one of the more controversial poisonous mushrooms in Wyoming.

False Morels contain a compound called Gyromitrin, which the human body metabolizes into Monomethylhydrazine, a major component in rocket fuel.

This compound can damage the liver, central nervous system, and occasionally the kidneys. Victims may experience diarrhea, vomiting, dizziness, headache, and even death.

Given this horrible effect, it will probably surprise you to learn that part of its Latin name, esculenta, means edible!

In order to eat these funky-looking mushrooms, people use specific cooking techniques. These may include blanching the mushrooms outside or in a well-ventilated area, as Gyromitrin can become airborne during cooking.

Unfortunately, several instances of poisoning from False Morels, including fatalities, have occurred. It’s best to leave these to the experts! DO NOT TRY EATING THIS MUSHROOM.

False Morels usually grow in deciduous and coniferous forests in temperate regions. They often thrive in areas with sandy soil, and in coniferous forests, they are frequently found around pine trees.


#3. Saddle-shaped False Morel

  • Gyromitra Infula

Types of poisonous mushrooms in Wyoming

  • Their surface may be smooth to somewhat bumpy and irregular, variable in color, and can be tan to yellowish brown, reddish brown, or dark brown.
  • The stems are roundish or slightly compressed and are usually white or pink-tinged with white mycelium near the base.

These toxic mushrooms get their name from their tell-tale, two-lobed saddle shape.

Though there are reports of people eating these mushrooms after boiling, most experts conclude Saddle-shaped False Morels are toxic. They contain contain the compound Gyromitrin.

Interestingly, the human body metabolizes Gyromitrin into Monomethylhydrazine, a significant component in rocket fuel.

Saddle-shaped False Morels usually grow in Wyoming in boreal, montane, or coastal forests. They often grow in close associations with several specific tree species, including Western White Pine, Black Spruce, Douglas Fir, Western Hemlock, Balsam Poplar, and Paper Birch.

You may spot Saddle-shaped False Morels growing singly or in small groups, often on rotten wood. It’s also commonly found growing on packed ground, like along rural roads or in campgrounds.


Learn more about things that grow in Wyoming.


Which of these poisonous mushrooms have you seen in Wyoming?

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