Field Macewort
Mannia triandra
Field Macewort (Mannia triandra) is a small, delicate liverwort characterized by its distinctive three-lobed thallus and tiny, inconspicuous reproductive structures. This bryophyte forms thin, green mats on soil surfaces and plays a crucial role in soil stabilization and moisture retention in its specialized microhabitats.
26
Countries
Taxonomy & Classification
Kingdom
Plantae
Phylum
Marchantiophyta
Class
Marchantiopsida
Order
Marchantiales
Family
Aytoniaceae
Genus
Mannia
Field Macewort belongs to the family Aytoniaceae, order Marchantiales, within the Marchantiopsida class.
Species Profile
Field Macewort (Mannia triandra) is a small, delicate liverwort characterized by its distinctive three-lobed thallus and tiny, inconspicuous reproductive structures. This bryophyte forms thin, green mats on soil surfaces and plays a crucial role in soil stabilization and moisture retention in its specialized microhabitats.
Field Macewort (Mannia triandra) is critically endangered primarily due to habitat loss and degradation of its specialized wetland environments. The species requires very specific moisture and substrate conditions that are increasingly rare due to agricultural intensification, drainage of wetlands, and climate change impacts on hydrological cycles.
Key Facts
Habitat & Distribution
Field Macewort inhabits disturbed calcareous soils in open grasslands, field margins, and occasionally on bare earth along pathways or in quarries. The species requires well-drained but periodically moist alkaline substrates with minimal vegetation competition.
Threats
IUCN Red List: Critically Endangered
Field Macewort (Mannia triandra) is critically endangered primarily due to habitat loss and degradation of its specialized wetland environments. The species requires very specific moisture and substrate conditions that are increasingly rare due to agricultural intensification, drainage of wetlands, and climate change impacts on hydrological cycles.
Agricultural intensification and land use change
Habitat loss and fragmentation
Wetland drainage and water management
Climate change and altered precipitation patterns
Pollution and eutrophication
Found in 26 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 | VUVulnerable | CRCritically Endangered | Lower local risk |
| EU | VUVulnerable | 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). Field Macewort (Mannia triandra). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/field-macewort