description Agaricus xanthodermus Overview
Agaricus xanthodermus, commonly called the yellow stainer, is a poisonous Agaricus mushroom that grows in lawns, gardens, and other grassy or disturbed places. It can resemble edible field or horse mushrooms, but its cap and stem turn bright chrome yellow when bruised or cut, especially at the stem base, and its odor is often compared with phenol, ink, or carbolic soap. Ingestion commonly causes gastrointestinal upset. [South Australian Herbarium](https://data.environment.sa.gov.au/Content/Publications/SHFacts%20Yellow%20Stainer.pdf)
help Agaricus xanthodermus FAQ
What is Agaricus xanthodermus?
Agaricus xanthodermus is the poisonous mushroom commonly called the yellow stainer. It often grows in lawns, gardens, and other grassy or disturbed places.
How can you recognize a yellow stainer mushroom?
The cap and stem can turn bright chrome yellow when bruised or cut, especially near the base of the stem. That color change is a useful warning sign, but mushroom identification should not rely on one feature alone.
Can Agaricus xanthodermus be mistaken for an edible mushroom?
Yes. It can resemble edible field or horse mushrooms, which makes it a common source of identification errors. Eating an unfamiliar Agaricus mushroom is unsafe without expert confirmation.
What symptoms can yellow stainer poisoning cause?
Yellow stainer poisoning commonly causes gastrointestinal illness such as stomach pain, nausea, vomiting, or diarrhea. Anyone who becomes ill after eating a wild mushroom should contact poison control or emergency medical services.
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