Hornschuch's Pseudocrossidium Moss
Pseudocrossidium hornschuchianum
Hornschuch's Pseudocrossidium Moss is a small, cushion-forming bryophyte with distinctive reddish-brown to dark green coloration and tightly packed leaves that help it retain moisture in arid conditions. This hardy moss plays a crucial role in soil stabilization and provides microhabitat for invertebrates in harsh environments where few other plants can survive.
50
Countries
Taxonomy & Classification
Kingdom
Plantae
Phylum
Bryophyta
Class
Bryopsida
Order
Pottiales
Family
Pottiaceae
Genus
Pseudocrossidium
Hornschuch's Pseudocrossidium Moss belongs to the family Pottiaceae, order Pottiales, within the Bryopsida class.
Species Profile
Hornschuch's Pseudocrossidium Moss is a small, cushion-forming bryophyte with distinctive reddish-brown to dark green coloration and tightly packed leaves that help it retain moisture in arid conditions. This hardy moss plays a crucial role in soil stabilization and provides microhabitat for invertebrates in harsh environments where few other plants can survive.
Hornschuch's Pseudocrossidium Moss faces severe decline due to habitat destruction from urban development, agricultural expansion, and infrastructure projects that eliminate the specialized calcareous substrates it requires. Climate change and air pollution further threaten remaining populations by altering the delicate moisture and chemical conditions necessary for this species' survival.
Key Facts
Habitat & Distribution
This moss typically colonizes exposed limestone rocks, mortar of old walls, and calcareous soil in open, sun-exposed locations. It thrives on basic substrates in Mediterranean climates and similar semi-arid regions where it can withstand periodic drought and intense solar radiation.
Threats
IUCN Red List: Endangered
Hornschuch's Pseudocrossidium Moss faces severe decline due to habitat destruction from urban development, agricultural expansion, and infrastructure projects that eliminate the specialized calcareous substrates it requires. Climate change and air pollution further threaten remaining populations by altering the delicate moisture and chemical conditions necessary for this species' survival.
Agricultural expansion and land conversion
Habitat loss from urban development
Air pollution and nitrogen deposition
Climate change altering moisture regimes
Infrastructure development
Found in 50 Countries
National vs Global Threat Status
How this species is assessed at the national level compared to its IUCN global status (EN).
| Country | National Status | Global Status | Comparison |
|---|---|---|---|
| EU | LCLeast Concern | ENEndangered | Lower local risk |
| EU | LCLeast Concern | ENEndangered | 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). Hornschuch's Pseudocrossidium Moss (Pseudocrossidium hornschuchianum). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/hornschuchs-pseudocrossidium-moss