Blue-Gray Rosette Lichen vs Brook Alder

Physcia caesia compared with Alnus maritima

Key Differences

• Blue-Gray Rosette Lichen is Least Concern while Brook Alder is Endangered.

Taxonomic Classification

Rank	Blue-Gray Rosette Lichen	Brook Alder
Kingdom	Fungi (Fungi)	Plantae (Plants)
Phylum	Ascomycota (Sac Fungi)	Magnoliophyta (Flowering Plants)
Class	Lecanoromycetes (Lecanoromycetes)	Magnoliopsida (Dicots)
Order	Caliciales (Caliciales)	Fagales (Beeches & Oaks)
Family	Physciaceae	Betulaceae
Genus	Physcia	Alnus
Species	Physcia caesia	Alnus maritima

Conservation Status

Blue-Gray Rosette Lichen

LC — Least Concern

Brook Alder

EN — Endangered

Physical Characteristics

Attribute	Blue-Gray Rosette Lichen	Brook Alder
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Blue-Gray Rosette Lichen

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, Sweden, and United States.

Brook Alder

Habitat

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

Range

Distributed across Belgium, France, Netherlands, and United Kingdom. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Blue-Gray Rosette Lichen

The Blue Gray Rosette Lichen (Physcia caesia) is a species in the genus Physcia. It is currently classified as Least Concern on the IUCN Red List. Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Brook Alder

The Brook Alder (Alnus maritima) is a species in the genus Alnus. It is currently classified as Endangered on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.