Which Mushrooms Are Bad for Your Lawn? (Solved & Explained!)

Contrary to what is believed, there are only a very select few mushrooms that are poisonous and can be bad for you and your lawn. It can be hard to tell if you have a dangerous one in your yard because they look so similar to safe mushrooms. 

There are seven types of mushrooms that are dangerous to both you and your yard. Knowing what they are and what they look like can save you from having a negative experience with them.

Fairy Rings

Fairy rings can be found in open grassy areas like a yard. The mushrooms grow in a giant circle and can cause damage to the grass in your yard. While they don’t directly attack grass, they break down the organic nutrients in the soil causing nitrogen to be released. This leaves a dark green ring in your grass.

Death Cap Mushroom

The Death Cap Mushroom is considered the most dangerous of all the mushrooms. These mushrooms will usually grow underneath oak trees, pine trees, beech trees, birch trees, chestnut trees, and eucalyptus trees.

Death Cap Mushrooms are easy to spot when you know what they look like. When they are young, these mushrooms will have a dome-shaped cap. As they mature, the cap will start to flatten.

These mushrooms are between two and five inches wide and around four and six inches tall. The color of the cap is usually an olive green, and the rim is really smooth. They will have dense, white gills that are free of the stalk.

One thing to remember when identifying mushrooms is that the Death Cap Mushroom has a very distinctive cup near the bottom of the stem and a skirt sitting below the cap.

Conocybe Filaris

This mushroom looks just like any other innocent lawn mushroom that commonly grows in the Pacific Northwest. They will mostly grow in yards with a lot of dead grass, dead moss, rich soil, decayed wood, or animal waste. 

The stem is long and skinny with a brown cap. The mushroom is tiny with the cap being less than 3 centimeters in diameter. The stem can be anywhere from 1 to 6 centimeters long and is only 2 millimeters thick.

Conocybe Filaris are dangerous to come in contact with and it can potentially be fatal if ingested. They can be extremely harmful to kids and pets, so it is important to identify and remove as quickly as possible.

Webcaps

There are two different types of Webcap mushrooms. There is the Deadly Webcap and the Fool’s Webcap. Both types are dangerous to have in your yard as they are poisonous. 

The good thing is these mushrooms are pretty rare. Webcaps are most commonly found in northern parts of Europe but can also be found throughout North America. 

The cap of the Deadly Webcap is a very light brown/orange color. When young, the cap is in a convex, but as they mature the cap flattens out some. It will usually range from 4 to 8 centimeters in diameter when the cap is fully extended.

The stem will usually be between 5 and 10 centimeters long and between 7 and 15 millimeters thick. The color of the stem is a yellowish color that kind of resembles snakeskin. You will mostly find them growing under pine trees and spruce trees.

It is really hard to determine the difference between a Deadly Webcap and a Fool’s Webcap because they look almost exactly the same. It is best to assume that any mushroom with this appearance is bad for you and your lawn and get rid of them.

Autumn Skullcap

The Autumn Skullcap mostly grows in the Northern Hemisphere and in parts of Australia. It is also known to be the most poisonous mushroom that can be found in North Carolina. You will find them growing in woodland areas or naturalized areas. 

The cap of the Autumn Skullcap is pretty small, staying between 1.5 and 2.5 inches in diameter. When they are wet, the caps are dark brown and become sticky. When dry, the caps are a yellowish-brown color.

The stem is usually a light brown to tan color and the base is a dense white. The gills at the top of the stem start out yellow and turn brown as the mushroom matures. The spores will be a rusty brown color.

Destroying Angels

Destroying Angels are actually more than one species of mushroom. They are several different types of all-white mushrooms that are extremely toxic. The worst thing about these mushrooms is how similar they look to regular meadow mushrooms and button mushrooms.

Destroying Angels have white stems and white caps that very rarely have a yellow, pink, or tan edge and center. They all have veils, and the gills are not attached to the stem. When they are young, the veil will cover the entire mushroom like an egg.

These mushrooms are most commonly found near the edges of woodlands or in yards that have trees and shrubs. You can also find a Destroying Angel anywhere in the world.

Podostroma Cornudamae

This dangerous mushroom is only found in Asia, but it has been responsible for many deaths in Japan and Korea. The bodies are easy to spot because they are bright red. This might draw you in because they are unique, but their bodies contain extremely potent toxins. 

Deadly Dapperling

The Deadly Dapperling is also mostly found in Europe and Asia. They commonly grow in parks, yards, and gardens, so they are often mistaken as being an edible mushroom.

When they are young, these mushrooms are a reddish-brown that fade to a pinkish-brown as they mature. The cap grows between 2.7 and 4 centimeters and is a convex when mature. The margin of the cap is inrolled and fleshy.

The gills are white and are not attached to the stem. The stem is short, usually only 2 to 3.5 centimeters tall and 0.6 to 0.9 centimeters wide. The top of the stem will usually be a pinkish-tan color and the bottom is covered with scales that are dark brown.