# Brown Roll-Rim (*Paxillus*)

Brown Roll-Rim is a brown fungus that has a unique shape! It can often be found in woodlands and likes to grow near trees.

- **Category:** [Fungi](https://www.snappit.app/explore/categories/fungi)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Habitat:** Woodlands
- **Also known as:** Brown Rollrim, Rollrim

![Brown Roll-Rim](https://res.cloudinary.com/drieglelr/image/upload/v1771424553/objects/5170.jpg)

## Appearance

The Brown Roll-Rim has a cap that starts convex with a distinctive inrolled margin, flattening and becoming funnel-shaped with age. Its color ranges from yellowish-brown to olive-brown, often with darker streaks. The gills are yellowish, easily detached, and bruise reddish-brown when handled.

## Taxonomy

- **Kingdom:** Fungi
- **Phylum:** Basidiomycota
- **Class:** Agaricomycetes
- **Order:** Boletales
- **Family:** Paxillaceae
- **Genus:** Paxillus

## Interesting facts

- Despite being a fungus, it's more closely related to boletes than gilled mushrooms!
- It was once thought edible, but is now known to be deadly poisonous!
- Its scientific name, 'Paxillus,' means a small peg, referring to its stem.
- This mushroom can cause your body's immune system to attack itself!

## Special abilities

- **Underground Helper:** Brown Roll-Rim can connect its roots with trees, sharing nutrients that help both organisms grow stronger.
- **Pollution Sponge:** Brown Roll-Rim can absorb heavy metals from the soil, which helps clean the environment but makes it dangerous to eat.
- **Wind Whisperer:** Brown Roll-Rim releases countless spores into the air, helping it spread far and wide to new forest homes.

## Measurements & details

- **Height:** 4-10 cm
- **Edible:** deadly
- **Size:** 5-15 cm
- **Growth Substrate:** soil
- **Season:** Late summer to autumn
- **Spore Color:** Brownish-yellow

## Ecological connections

- **Symbiotic with:** [Silver Birch](https://www.snappit.app/explore/silver-birch) (*Betula pendula*) — Helps this tree absorb water and nutrients from the soil.
- **Symbiotic with:** [Norway Spruce](https://www.snappit.app/explore/norway-spruce) (*Picea abies*) — Forms vital nutrient-sharing partnership with its roots.
- **Eaten by:** [Black Slug](https://www.snappit.app/explore/black-slug) (*Arion ater*) — This slug often feeds on its decaying mushroom caps.

## Traits

- [Deciduous](https://www.snappit.app/explore/traits/deciduous): Deciduous plants periodically shed all their leaves, typically during autumn or dry seasons.
- [Spore Producing](https://www.snappit.app/explore/traits/spore-producing): Spore-producing organisms reproduce by releasing small, often single-celled, reproductive units called spores.
- [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life.

## Collections

- [Fungi](https://www.snappit.app/explore/collections/fungi)

## Safety

**Danger:** 1/5 · Very low

Do not pick or eat anything you find. Some plants and mushrooms can be harmful.

## Frequently Asked Questions

### How to identify Brown Roll-Rim?

Compare the cap shape, the underside, the stem and base, and whether the fungus grows on wood or soil. Some fungi have gills, others pores or teeth. A cap seen only from above often hides the most useful features. Mushroom Identifier: upload a photo and compare the visible details.

### How tall is Brown Roll-Rim?

4-10 cm

### Is Brown Roll-Rim edible?

deadly

### How big is Brown Roll-Rim?

5-15 cm

### Where is Brown Roll-Rim usually found?

Woodlands

### What does Brown Roll-Rim grow on?

soil

### When is Brown Roll-Rim in season?

Late summer to autumn

### What color are Brown Roll-Rim spores?

Brownish-yellow

## More Fungi

- [Field Mushroom](https://www.snappit.app/explore/field-mushroom) (*Agaricus*)
- [Button Mushroom](https://www.snappit.app/explore/button-mushroom) (*Agaricus*)
- [Portobello Mushroom](https://www.snappit.app/explore/portobello-mushroom) (*Agaricus*)
- [Shiitake](https://www.snappit.app/explore/shiitake) (*Lentinula*)

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Source: [Brown Roll-Rim: Facts & Places to See — Snappit](https://www.snappit.app/explore/brown-roll-rim)