Chalk Screw-moss vs Wall Screw-moss

Tortula vahliana compared with Tortula muralis

Key Differences

• Chalk Screw-moss is Vulnerable while Wall Screw-moss is Least Concern.

Taxonomic Classification

Rank	Chalk Screw-moss	Wall Screw-moss
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Bryophyta	Bryophyta
Class same	Bryopsida (Bryopsida)	Bryopsida (Bryopsida)
Order same	Pottiales (Pottiales)	Pottiales (Pottiales)
Family same	Pottiaceae	Pottiaceae
Genus same	Tortula	Tortula
Species	Tortula vahliana	Tortula muralis

Evolutionary Relationship

Chalk Screw-moss and Wall Screw-moss share a common ancestor at the Genus level: Tortula.

Conservation Status

Chalk Screw-moss

VU — Vulnerable

Wall Screw-moss

LC — Least Concern

Physical Characteristics

Attribute	Chalk Screw-moss	Wall Screw-moss
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Chalk Screw-moss

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

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

Wall Screw-moss

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (6 countries), and South America (Brazil, Chile).

Chalk Screw-moss

The Chalk Screw-moss (Tortula vahliana) is a species in the genus Tortula. It is currently classified as Vulnerable on the IUCN Red List. Native to Europe, inhabiting ecosystems characteristic of the region.

Shared Countries

Both species can be found in 3 countries:

🇧🇪 Belgium 🇳🇴 Norway 🇵🇹 Portugal