Fly Agaric vs Marsh Cress

Amanita muscaria compared with Rorippa islandica

Key Differences

Fly Agaric is Least Concern while Marsh Cress is Endangered.

Taxonomic Classification

Rank	Fly Agaric	Marsh Cress
Kingdom	Fungi (Fungi)	Plantae (Plants)
Phylum	Basidiomycota (Club Fungi)	Magnoliophyta (Flowering Plants)
Class	Agaricomycetes (Mushrooms)	Magnoliopsida (Dicots)
Order	Agaricales (Gilled Mushrooms)	Brassicales (Brassicales)
Family	Agaricaceae (Agarics)	Brassicaceae
Genus	Amanita (Amanitas)	Rorippa
Species	Amanita muscaria	Rorippa islandica

Conservation Status

Fly Agaric

LC — Least Concern

Trend: Stable →

Marsh Cress

EN — Endangered

Physical Characteristics

Attribute	Fly Agaric	Marsh Cress
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).

Marsh Cress

Habitat

Found across multiple habitat types including boreal forests and taiga, flooded grasslands and savannas, and Mediterranean forests and woodlands, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (Libya), Asia (India), Europe (Iceland, Norway, Sweden), and North America (Canada, Mexico, United States). Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

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.