Fly Agaric vs Rollrim Milkcap

Amanita muscaria compared with Lactarius resimus

Key Differences

• Fly Agaric is Least Concern while Rollrim Milkcap is Near Threatened.

Taxonomic Classification

Rank	Fly Agaric	Rollrim Milkcap
Kingdom same	Fungi (Fungi)	Fungi (Fungi)
Phylum same	Basidiomycota (Club Fungi)	Basidiomycota (Club Fungi)
Class same	Agaricomycetes (Mushrooms)	Agaricomycetes (Mushrooms)
Order	Agaricales (Gilled Mushrooms)	Russulales (Russulales)
Family	Agaricaceae (Agarics)	Russulaceae
Genus	Amanita (Amanitas)	Lactarius
Species	Amanita muscaria	Lactarius resimus

Evolutionary Relationship

Fly Agaric and Rollrim Milkcap share a common ancestor at the Class level: Agaricomycetes. (Mushrooms)

Conservation Status

Fly Agaric

LC — Least Concern

Trend: Stable →

Rollrim Milkcap

NT — Near Threatened

Physical Characteristics

Attribute	Fly Agaric	Rollrim Milkcap
Diet	Decomposer	—
Average Lifespan	1 years	—
Average Length	20 cm	—
Average Weight	100 g	—

Habitat & Geographic Range

Fly Agaric

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Widely distributed across Europe (4 countries), North America (United States), Oceania and the Pacific (New Zealand), and South America (Brazil, Chile, Colombia).

Rollrim Milkcap

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Fly Agaric

Among the most iconic and recognizable fungi on Earth, fly agaric mushrooms display striking red caps with white flecked warts across boreal forests of the Northern Hemisphere. Despite their fairy-tale appearance, they contain potent psychoactive compounds including muscimol and ibotenic acid and are moderately toxic. They form critical mycorrhizal symbioses with birch, pine, and spruce trees, exchanging mineral nutrients for carbon and playing essential roles in boreal forest nutrient cycling.

Shared Countries

Both species can be found in 4 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden 🇺🇸 United States