description Cortinarius orellanus Overview
Cortinarius orellanus, commonly called the fool's webcap, is a poisonous mushroom in the genus Cortinarius and is native to parts of Europe. Its principal toxin is orellanine, a nephrotoxin that can damage the kidneys after ingestion. Poisoning is difficult to recognize because symptoms may be delayed for several days or weeks, and severe cases can lead to acute or permanent kidney failure requiring dialysis or transplantation. [Norwegian Institute of Public Health](https://www.helsenorge.no/en/poison-information/poisonous-mushrooms)
help Cortinarius orellanus FAQ
What is Cortinarius orellanus commonly called?
Cortinarius orellanus is commonly called the fool's webcap. It is a poisonous European mushroom in the genus Cortinarius.
What toxin makes Cortinarius orellanus dangerous?
Its principal toxin is orellanine, a nephrotoxin that can injure the kidneys. The damage may become serious even when early symptoms seem mild.
Why is Cortinarius orellanus poisoning hard to recognize?
Symptoms can be delayed, and the mushroom may not cause obvious illness immediately after eating. That delay can make the connection with a meal difficult to recognize.
What should someone do after eating a suspected Cortinarius mushroom?
Do not wait for symptoms to appear. Contact emergency services or a poison center promptly, keep a sample or photograph if it can be collected safely, and seek medical testing because kidney injury may develop later.
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