Fly Agaric vs Spiny Bear's-breech

Amanita muscaria compared with Acanthus spinosus

Key Differences

• Fly Agaric is Least Concern while Spiny Bear's-breech is Not Evaluated.

Taxonomic Classification

Rank	Fly Agaric	Spiny Bear's-breech
Kingdom	Fungi (Fungi)	Plantae (Plants)
Phylum	Basidiomycota (Club Fungi)	Magnoliophyta (Flowering Plants)
Class	Agaricomycetes (Mushrooms)	Magnoliopsida (Dicots)
Order	Agaricales (Gilled Mushrooms)	Lamiales (Lamiales)
Family	Agaricaceae (Agarics)	Acanthaceae
Genus	Amanita (Amanitas)	Acanthus
Species	Amanita muscaria	Acanthus spinosus

Conservation Status

Fly Agaric

LC — Least Concern

Trend: Stable →

Spiny Bear's-breech

NE — Not Evaluated

Physical Characteristics

Attribute	Fly Agaric	Spiny Bear's-breech
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).

Spiny Bear's-breech

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Belgium, France, Netherlands, and United Kingdom.

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.