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Brown roll-rim

Paxillus involutus

A species of Rollrims, Also known as Common roll-rim, Naked brimcap

This wide-capped toadstool grows all around the world in temperate zones of the northern and southern hemispheres. Brown roll-rim mushrooms are known to be poisonous when consumed, causing immediate gastric upset if eaten raw and damaging vital organs of the body even when cooked, leading to death over time.

Cap Diameter:

5 - 15 cm

Odor:

Mild, non-distinctive or faintly fragrant.

General Info About Brown roll-rim

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Attributes of Brown roll-rim

Cap Diameter

5 - 15 cm

Height

6 - 12 cm

Cap

Cap 4 - 15 cm across; convex to flat; ocher-buff to olive-buff, tan to brown; surface smooth, with finely downy

Cap Shape

Convex, Depressed

Cap Surfaces

Smooth, Slimy or slightly sticky, Visible lines or stripes

Gills

Decurrent; close, crowded; ocher-buff to brown; turns dark brown when bruised

Gill Attachment

Decurrent

Stem

Stem 2 - 8 cm long, 2 cm thick; buff; surface smooth, with finely hairy; turns brownish to reddish brown when bruised

Stem Shapes

Tapering

Stem Surfaces

Smooth

Flesh

Thick; firm; yellowish; turns brown when exposed

Ring

Ringless

Spore Print Color

Brown

Odor

Mild, non-distinctive or faintly fragrant.

Body Color

Brown

Green

Yellow

Gray

Flesh Bruises

Discolor to brown

Growth Form

Solitary, Scattered, Gregarious

Nutrient Gathering

Mycorrhizal, Saprophytic

Substrate

On soil, Dead Woods

You can find Brown roll-rim by these plants:

Pines, Spruces, Oaks, Populus

Occurence Habitats

Deciduous Woodland, Coniferous Woodland, Mixed Woodland, Meadows

Species Status

Widely distributed

Endangered Species

How to Identify Brown roll-rim

Fruiting Body Cap Gills

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Habitat of Brown roll-rim

Brown roll-rim mushrooms appear under trees of all types and are especially fond of birch. They exist in a symbiotic relationship with a tree’s roots. Brown roll-rim mushrooms occasionally also survive on decaying wood.

Distribution Area of Brown roll-rim

North America,Europe,North Africa,northern Asia;introduced in southern South America,Australia,New Zealand

Scientific Classification of Brown roll-rim

Phylum

Club fungi

Class

Mushroom-forming fungi

Order

Boletes and allies

Family

Paxillaceae

Genus

Rollrims

Toxicity and Edibility of Brown roll-rim

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Is Brown roll-rim Toxic?

Brown roll-rim is commonly found in acidic, deciduous and coniferous woodlands, especially in nutrient-poor soils during summer and autumn. It has a convex cap that flattens with age and rolls inward at the margin, helping to distinguish it. Consumption, particularly raw, may result in red cell destruction, anemia, kidney failure, jaundice, or fatal outcomes.

Type of poisoning

Immunohemolytic

Toxic Severity

Extreme toxicity

Incubation Period

2-14 days

Poisoning Symptoms

Symptoms may include the destruction of red blood cells, leading to anemia, jaundice, kidney failure, and in severe cases, death. The risk of an adverse reaction predominantly exists with raw mushrooms that have hemolysins.

Is Brown roll-rim Toxic to Dogs?

Brown roll-rim is toxic to dogs but the exact toxin is unknown. Symptoms are generally not severe except in the case of hypersensitive animals, where poisoning can result in kidney failure and death. Therefore medical treatment should be sought if a dog eats these mushrooms. Symptoms include diarrhea, vomiting, irregular heartbeat, and low red blood cell count. This is a common mushroom that dogs can easily encounter, increasing the risk of poisoning.

Similar Species to Brown roll-rim

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Tips for Finding Brown roll-rim

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What are the Ideal Soil Conditions for Brown roll-rim

Prefers acidic soil conditions.

What are Some Tips for Finding Brown roll-rim

Search in mixed woodland areas, focusing on spots where hardwoods meet conifers.
Include urban parks and gardens in your search areas, taking note of trees present as brown roll-rim can be associated with them.
Examine the base of trees and areas with decaying wood as brown roll-rim can be found there.
When in heathlands or grasslands, look carefully around birch trees and on lawns for the presence of brown roll-rim.
Carefully inspect the forest floor for brown roll-rim among leaf litter and decomposing wood materials.