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Deadly☠️ To avoid

🍄 Brown roll-rim

Paxillus involutus · Paxillaceae

🌳 Temperate Europe🌲 Boreal🍁 North America
🧠 To remember it“Tolerated today, fatal tomorrow” — the roll-rim proves that a mushroom eaten a hundred times without issue can kill you on the hundred and first.
Brown roll-rim — Paxillus involutus

🔍 Identify it without mistakes

An olive-brown mushroom once consumed massively in Central and Eastern Europe after cooking, now reclassified as potentially lethal: it is not a classic toxin that kills, but an autoimmune mechanism. Repeated ingestions eventually sensitize the immune system of certain individuals, who then develop a severe and sometimes fatal reaction, even after a meal that had never caused any problems before.

  1. olive-brown to reddish-brown cap, inrolled margin towards the inside (the distinctive feature that gives it its name), velvety surface becoming slimy in wet weather
  2. decurrent gills (running down the stem), yellowish, turning brown when touched or cut
  3. short stem, same color as the cap
  4. grows in association with many trees (birch, conifers, broadleaf trees)
Sizecap 4-12 cm, stem 3-8 cm
Floweringsummer-autumn
Habitatvaried forests, often associated with birch trees

⚠️ Not to be confused with

No confusion sought: the risk comes from its repeated traditional consumption (—)—

To tell them apart: the brown roll-rim itself must no longer be consumed, regardless of the number of previous incident-free meals: immune sensitization can occur at any time after years of apparently risk-free consumption

☠️ What kills

nomImmuno-hemolytic mechanism (not a classic toxin): the mushroom triggers the production of antibodies in certain sensitized individuals that destroy their own red blood cells upon new ingestion
dose letale estimeenot applicable as for a classic toxin; a normal meal can trigger a potentially fatal reaction in an already sensitized person, regardless of the amount consumed in previous times
delai1 to 2 hours after the triggering meal in an already sensitized person
symptomesacute, sudden hemolytic anemia (extreme fatigue, paleness, dark urine), shock, acute renal failure in severe cases caused by hemoglobin deposits in the kidneys
antidoteno antidote; emergency treatment with transfusion, corticosteroids, and sometimes dialysis in case of kidney involvement
morts documenteesyes — several documented deaths in Europe, particularly in Germany and Eastern Europe where the mushroom was traditionally consumed after prolonged cooking

First steps : Seek emergency medical help in case of extreme fatigue, paleness, or dark urine after a meal of mushrooms, even for someone who has previously eaten them without issue. Call poison control. Permanently stop all consumption of brown roll-rim, regardless of past apparent tolerance.

Sources (3)

No entry replaces a certain identification in the field, or medical advice. When in doubt: don't eat it. If ingestion is suspected: poison control or 112/911.