Rock Foam vs

Stereocaulon saxatile compared with Stereocaulon evolutum

Key Differences

• Rock Foam is Near Threatened while is Endangered.

Taxonomic Classification

Rank	Rock Foam
Kingdom same	Fungi (Pilze)	Fungi (Pilze)
Phylum same	Ascomycota (Schlauchpilze)	Ascomycota (Schlauchpilze)
Class same	Lecanoromycetes (Lecanoromycetes)	Lecanoromycetes (Lecanoromycetes)
Order same	Lecanorales (Lecanorales)	Lecanorales (Lecanorales)
Family same	Stereocaulaceae	Stereocaulaceae
Genus same	Stereocaulon	Stereocaulon
Species	Stereocaulon saxatile	Stereocaulon evolutum

Evolutionary Relationship

Rock Foam and share a common ancestor at the Genus level: Stereocaulon.

Conservation Status

Rock Foam

NT — Near Threatened

EN — Endangered

Physical Characteristics

Attribute	Rock Foam
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Rock Foam

Habitat

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

Range

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

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, and Sweden. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Stereocaulon evolutum is a fruticose lichen in the family Stereocaulaceae, assessed as Endangered (EN). It forms erect, branched pseudopodetia with granular cephalodia containing nitrogen-fixing cyanobacterial partners. Its endangered status reflects sensitivity to habitat disturbance and air quality degradation.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden