Acaulon mediterraneum
Local name: hårsvøpmose
Acaulon mediterraneum is a tiny acrocarpous moss species characterized by its extremely small size, lack of a visible stem (acaulescent growth form), and distinctive spore capsules that remain embedded within the leaf rosettes. This diminutive bryophyte plays a crucial role in soil stabilization and microhabitat creation in Mediterranean ecosystems, forming part of the cryptobiotic crust communities that support other specialized flora.
12
Countries
Taxonomy & Classification
Kingdom
Plantae
Phylum
Bryophyta
Class
Bryopsida
Order
Pottiales
Family
Pottiaceae
Genus
Acaulon
Acaulon mediterraneum belongs to the family Pottiaceae, order Pottiales, within the Bryopsida class.
Species Profile
Acaulon mediterraneum is a tiny acrocarpous moss species characterized by its extremely small size, lack of a visible stem (acaulescent growth form), and distinctive spore capsules that remain embedded within the leaf rosettes. This diminutive bryophyte plays a crucial role in soil stabilization and microhabitat creation in Mediterranean ecosystems, forming part of the cryptobiotic crust communities that support other specialized flora.
Acaulon mediterraneum faces severe threats from habitat destruction and degradation of its specialized Mediterranean coastal environments. Urban development, agricultural expansion, and climate change are rapidly reducing the availability of suitable sandy and rocky substrates where this moss species can establish and persist.
Key Facts
Habitat & Distribution
This moss inhabits exposed calcareous soils, rocky crevices, and thin soil layers over limestone substrates in Mediterranean scrublands and open woodlands. It typically occurs on south-facing slopes and terraced landscapes where it colonizes disturbed ground and forms part of pioneer plant communities on mineral-rich, well-drained soils.
Threats
IUCN Red List: Critically Endangered
Acaulon mediterraneum faces severe threats from habitat destruction and degradation of its specialized Mediterranean coastal environments. Urban development, agricultural expansion, and climate change are rapidly reducing the availability of suitable sandy and rocky substrates where this moss species can establish and persist.
Agricultural intensification and land use change
Climate change and altered precipitation patterns
Habitat loss due to coastal development
Invasive plant species competition
Trampling and recreational pressure
Found in 12 Countries
National vs Global Threat Status
How this species is assessed at the national level compared to its IUCN global status (CR).
| Country | National Status | Global Status | Comparison |
|---|---|---|---|
| EU | NTNear Threatened | CRCritically Endangered | Lower local risk |
| EU | NTNear Threatened | CRCritically Endangered | Lower local risk |
National Red List data sourced from the National Red List Project (nationalredlist.org, ZSL) and country-specific Red List authorities.
Community Sightings
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Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
National Red Lists: ZSL (2025). National Red List. Zoological Society of London. Available at: https://www.nationalredlist.org
This page: SpeciesRadar (2025). Acaulon mediterraneum (Acaulon mediterraneum). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/harsvpmose