Horse Mushroom (Agaricus Arvensis) Gourmet Mushroom Culture



Your order today will contain:

(1) Sterile 12 ml syringe with locking cap, filled with fresh Horse Mushroom (Agaricus Arvensis) Gourmet Mushroom  mycelium. 

(1) Mylar syringe sleeve for long-term storage.

(2) Alcohol pads.

(1) 16-gauge needle.

(1) Cold / Warm Weather insert (depending on shipping location and time of year)

(1) Free 20-gram sample pack of my mushroom nutrient broth premix.

A $15 value, make 1 liter of your own lab-quality mushroom liquid culture.


horse mushroom
horse mushroom

Agaricus arvensis, commonly known as the horse mushroom, is a mushroom of the genus Agaricus.

The horse mushroom (Agaricus arvensis) is a common, widespread, excellent edible mushroom species. It looks similar to the button mushroom, which it is related to. It is called the horse mushroom because it often appears near stables, loving the manure-rich soil.

Agaricus arvensis

The horse mushroom LOVES nutrient rich lawns, and pastures.

Horse mushrooms are a choice edible which appear in pastures, fields, and other grassy areas. They’ve been collected from all over the world, including Europe, Australia, Asia, and North America. The scientific name arvensis means “of the fields” or ” of the meadows.”

While these mushrooms are widespread and excellent eating, identifying them can get a little tricky. It is essential to pay attention to details with this one, so it doesn’t get mistaken for a toxic species. There are no seriously poisonous lookalikes, but extreme gastrointestinal distress is not something we wish upon anyone.

The history and tracking of this mushroom in North America is a wee bit complicated. It turns out one mushroom looks so similar it was lumped into the horse mushroom species without question. However, more recent analysis determines these are two different but almost identical-looking species.
Agaricus fissuratus is also widely distributed and edible, so don’t stress too much if you confuse them. It is also commonly called the horse mushroom, so the confusion continues unabated with name and appearance.


Summer through fall.


Horse mushrooms are saprobic, meaning they feed off dead and decaying organic material. They grow singularly or in scattered or dense groupings. It’s not uncommon to find them bunched together and overlapping.

This mushroom only grows from the ground; it does not grow on trees. It can be found in grassy areas, like meadows, fields, and lawns. As the common name indicates, it is also common in horse pastures, liking the rich mature there. These mushrooms often appear in fairy rings, too.

It seems to have a fondness for spruce or appreciates nutrient-rich soil, just like spruce trees.


The cap of the this mushroom starts out whitish or buff but yellows slowly with age. It is smooth or has very fine fibrous scales. In youth, the mushroom cap is bell-shaped, just like the grocery store button mushroom. With age, the cap flattens out to take on a dinner plate appearance. The cap turns yellowish when handled or bruised. It ranges in size from 3-8 inches wide. Sometimes, the caps get super large, up to 12 inches wide.


Horse mushroom gills start out a pale pink, then darken to chocolate brown with maturity. The gills do not attach to the stem, and they are tightly arranged. When the mushroom is very young, in its button stage, the gills are covered by a thick white cottony fiber. This is the universal veil; it breaks apart and wears away with age, leaving only a skirt around the stem as evidence it was there.


The stem is thick and white with a bulbous base. Around the top of the stem is a white skirt, a remnant of the cotton-like veil that covered it in youth. The skirt is thick and double-layered with a cog-wheel pattern on the underside. Above the skirt, the stem is smooth. Below the skirt, the stem might be smooth or covered in fine white fibrous scales.

Horse mushroom stems are solid and grow up to 4″ tall.

Flesh and Scent

The flesh of the mushroom is white and does not change color when cut, or it might turn very faintly yellowish. It smells strongly of anise but does not have a distinctive taste. The anise scent is more robust in younger specimens.

Spore Print

Dark purplish-brown


Additional information

Weight 1 oz
Dimensions 9 × 6 × 1 in

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