Riccia ciliata
Local name: hårig rosett
Riccia ciliata is a small thallose liverwort characterized by its distinctive hairy or ciliated margins that give it its common name 'hårig rosett' (hairy rosette). This bryophyte forms small, flat, ribbon-like green thalli that grow in rosette patterns on bare soil surfaces.
Taxonomy & Classification
Kingdom
Plantae
Phylum
Marchantiophyta
Class
Marchantiopsida
Order
Marchantiales
Family
Ricciaceae
Genus
Riccia
Riccia ciliata belongs to the family Ricciaceae, order Marchantiales, within the Marchantiopsida class.
Species Profile
Riccia ciliata is a small thallose liverwort characterized by its distinctive hairy or ciliated margins that give it its common name 'hårig rosett' (hairy rosette). This bryophyte forms small, flat, ribbon-like green thalli that grow in rosette patterns on bare soil surfaces. As a pioneer species, it plays a crucial role in soil stabilization and provides microhabitat for other small organisms in early successional communities.
Riccia ciliata faces severe threats primarily from habitat loss and degradation of its specialized wetland environments. The species requires specific moisture conditions and substrate types that are increasingly rare due to human activities and climate change. Its extremely limited distribution makes it particularly vulnerable to local extinctions.
Key Facts
Habitat & Distribution
Riccia ciliata typically inhabits the muddy margins of temporary pools, ditches, and seasonally flooded areas where it colonizes bare, mineral-rich soils. It thrives in areas with fluctuating water levels that experience periodic drying, often found alongside other ephemeral wetland specialists in agricultural landscapes and floodplains.
Threats
IUCN Red List: Critically Endangered
Riccia ciliata faces severe threats primarily from habitat loss and degradation of its specialized wetland environments. The species requires specific moisture conditions and substrate types that are increasingly rare due to human activities and climate change. Its extremely limited distribution makes it particularly vulnerable to local extinctions.
Agricultural intensification
Drainage of wetlands and water bodies
Habitat loss and fragmentation
Climate change and altered precipitation patterns
Pollution and eutrophication
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 | DDData Deficient | CRCritically Endangered | Lower local risk |
| EU | DDData Deficient | 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). Riccia ciliata (Riccia ciliata). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/harig-rosett