Caesar's Amanita vs Common Frillwort

Amanita caesarea compared with Fossombronia pusilla

Key Differences

• Caesar's Amanita is Least Concern while Common Frillwort is Critically Endangered.

Taxonomic Classification

Rank	Caesar's Amanita	Common Frillwort
Kingdom	Fungi (Fungi)	Plantae (Plants)
Phylum	Basidiomycota (Club Fungi)	Marchantiophyta (liverwort)
Class	Agaricomycetes (Mushrooms)	Jungermanniopsida (Jungermanniopsida)
Order	Agaricales (Gilled Mushrooms)	Fossombroniales (Fossombroniales)
Family	Agaricaceae (Agarics)	Fossombroniaceae
Genus	Amanita (Amanitas)	Fossombronia
Species	Amanita caesarea	Fossombronia pusilla

Conservation Status

Caesar's Amanita

LC — Least Concern

Common Frillwort

CR — Critically Endangered

Physical Characteristics

Attribute	Caesar's Amanita	Common Frillwort
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Caesar's Amanita

Habitat

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

Range

Distributed across Belgium, Taiwan, and United States.

Common Frillwort

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, temperate broadleaf and mixed forests, and Mediterranean forests and woodlands spanning the Indomalayan and Palearctic realms. Populations are also found in montane and highland environments at higher elevations.

Range

Found across Asia (Taiwan) and Europe (5 countries). Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Caesar's Amanita

The Caesar's Amanita (Amanita caesarea) is a species in the genus Amanita. It is currently classified as Least Concern on the IUCN Red List. Typically found in forest floors, decomposing wood, and soil ecosystems.

Common Frillwort

<em>Fossombronia pusilla</em>, commonly known as the common frillwort, is a small liverwort belonging to the family Fossombroniaceae within the division Marchantiophyta. This non-vascular bryophyte typically grows in moist, disturbed soils, clay banks, and damp pathways across its range in Europe and parts of Asia. The thallus is typically lobed and frilly in appearance, giving the species its common name. <em>Fossombronia pusilla</em> favors habitats with high moisture and reduced competition, often colonizing bare or sparsely vegetated ground following disturbance. Its geographic range spans temperate regions of western and central Europe into Asia, though populations have become increasingly fragmented. The species is currently assessed as Critically Endangered on the IUCN Red List, reflecting severe population declines likely driven by habitat loss, land drainage, and agricultural intensification. Biological traits such as lifespan, body size, and diet remain poorly documented for this species, as is common among many small bryophyte taxa. Like other liverworts, <em>Fossombronia pusilla</em> reproduces both sexually through spores and vegetatively. Conservation of this species depends on protecting moist, low-competition microhabitats and reducing disturbance to its specialized substrates.

Shared Countries

Both species can be found in 2 countries:

🇧🇪 Belgium 🇹🇼 Taiwan