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Brown Roll Rims (Paxillus Involutus) Identification

Identifying Brown Roll Rims (Paxillus Involutus)


Common names

Brown Roll rims, Common roll rim, poison pax

Botanical name

Paxillus Involutus

Meaning of Scientific classification

The name derives from Paxillus meaning small stake or peg and Involutus refers to the in rolled cap margin.

Class: Agaricomycetes

Order: Boletales

Kingdom: Fungi

Division: Basidiomycota

Could be confused with

Can look like some of the milk cap (Lactarius) species but these all exude a milk-like substance when damaged.

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Very common in the UK and Europe.

Key features and habitat of Brown roll rim mushrooms


Caps are typically around 6-20 cm in diameter. When young the caps are convex but soon flatten out with a slight depression towards the centre. As the common name suggests they are brown in colour, with faint striations along the cap margin.

JoanS-Fortún Ripoll, CC BY-SA 3.0 <>, via Wikimedia Commons
Dr. Hans-Günter Wagner, CC BY-SA 2.0 <>, via Wikimedia Commons


The gills are pale yellow/brown, crowded and run partway down the stem, when damaged they bruise darker brown. The cap margin is in rolled hence the common name roll rim.

Decurrent Gill
This image was created by user Daniel B. Wheeler (Tuberale) at Mushroom Observer, a source for mycological images.You can contact this user here.English | español | français | italiano | македонски | മലയാളം | português | +/−, CC BY-SA 3.0 <>, via Wikimedia Commons

Habitat & Season

They form ectomycorrhizal relationships with both hardwoods and conifers and are most commonly found in late summer and autumn.


Brown – Yellowish/Brown

Edible uses

Although this species was eaten in the past and is still apparently consumed in Eastern Europe it was responsible for the death of the German mycologist Julius Schaffer in 1944. It has since been found to cause potentially fatal autoimmune damage by triggering your immune system to attack red blood cells leading to complications such as acute kidney shock and acute respiratory failure.

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