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Paxillus involutus.   Click a photo to enlarge it.   back to list

synonyms: Brown Rollrim, Kahler Krempling, Paxille enroulé
Paxillus involutus 2 Mushroom
Ref No: 8484
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Paxillus involutus3 Mushroom
Ref No: 8485
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Paxillus involutus Mushroom
Ref No: 8486
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location: North America, Europe
edibility: Poisonous/Suspect
fungus colour: Brown
normal size: 5-15cm
cap type: Funnel shaped
flesh: Flesh discolours when cut, bruised or damaged, Mushroom slimy or sticky
spore colour: Light to dark brown
habitat: Grows in woods, Grows on the ground

Paxillus involutus (Fr.) Fr. Kahler Krempling Paxille enroulé Brown Rollrim. Cap 5–12cm across, ochraceous or fulvous with olivaceous flush at first becoming more rusty-brown and finally hazel or snuff brown, viscid at centre when wet, downy throughout particularly at margin which remains inrolled, becoming smooth later. Stem up to 75 x 8–12mm, concolorous with cap becoming stained chestnut especially with age or on bruising. Flesh pale ochre in cap, fulvous in stem base, darkening on cutting. Taste acidic, smell fungusy. Gills decurrent, crowded, pale ochre then sienna, bruising vinaceous or chestnut. Spore print sienna. Spores ellipsoid, 8–10 x 5–6um. Habitat in broad-leaved woodland, especially with birch on acid heathland. Season late summer to late autumn. Very common. Deadly Poisonous – After eating over a period it has been known to cause death. Distribution, America and Europe.

Members' images and comments

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Lyubomir Radoev (Bulgaria) - 16 June 2013

Paxillus involutus
john Baker (United Kingdom) - 01 August 2009

Surrey (Cobham) garden
Paxillus involutus
lee collins (United Kingdom) - 28 April 2009

Brown Roll Rim
Paxillus involutus
Lorand Bartho (Hungary) - 09 March 2009

According to patients' reports, P. involutus is a tasty mushroom. Most people do not develop poisoning upon the first or first few consumptions. "Poisoning" of this mushroom involves a special kind of allergic reaction. Even properly cooked specimens contain an (unknown) allergen that, unfortunately, can be absorbed from the intestine. It then stimulates antibody production by the immune cells. This may take some time and may need more than one exposure to the allergen. The antibodes get attached (fixed) to red blood cells, and upon repeated consumption of P. involutus (i.e., re-exposure to the allergen) a dissolution of these cells (hemolysis) may occur, with potentially deadly consequences. Chills and elevation of body temperature as well as feeling sick may be the first symptoms, but the most dangerous complication is kidney damage, caused by the oxygen-binding compound hemoglobin, released from ruptured red blood cells.
Lorand Bartho (Hungary) - 06 March 2009

Paxillus involutus
Lorand Bartho (Hungary) - 06 March 2009

Paxillus involutus
Lorand Bartho (Hungary) - 06 March 2009

Hungarian name, Begöngyöltszélü cölöpgomba
Paxillus involutus
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