description Agaricus arvensis Overview
Agaricus arvensis, commonly called the horse mushroom, is a species of mushroom in the genus Agaricus that grows in grassland and other open habitats. It is recognized by its pale cap, pink-to-brown gills as it matures, substantial ring, and an anise or almond-like odor; the flesh may show yellow staining. It is commonly described as edible, but it can be confused with toxic Agaricus species such as the yellow stainer, so identification requires more than a single visual trait.
help Agaricus arvensis FAQ
Is Agaricus arvensis, the horse mushroom, edible?
Yes, the horse mushroom is widely regarded as a good edible species in the Agaricus genus, related to the cultivated button mushroom. As with all wild Agaricus, it should only be eaten after confident identification and proper cooking.
How do I tell a horse mushroom from the poisonous yellow stainer?
The dangerous lookalike is Agaricus xanthodermus, which stains chrome yellow at the stem base when cut and smells of ink or carbolic soap. A horse mushroom shows no strong yellow staining and instead has a pleasant anise or almond-like odor, with pink gills that mature to brown.
Why is it called the horse mushroom, and where does it grow?
It grows in grassland and open habitats such as pastures, often in areas grazed by horses and livestock, which gave rise to the common name. It typically fruits in summer and autumn across Europe and North America.
Is it safe to pick horse mushrooms from fields and roadsides?
Identification aside, caution is warranted because Agaricus species like the horse mushroom are known to accumulate heavy metals such as cadmium from soil. Avoid collecting from roadside verges, contaminated land, or heavily treated agricultural fields.
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