Field Macewort
CR

Field Macewort

Mannia triandra

UnknownVUEUVUEU

Photo: Photo: (c) Dr. Oliver Dürhammer, some rights reserved (CC BY-NC), uploaded by Dr. Oliver Dürhammer

Overview

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.

Threat summary

Habitat

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.

Other threatened species in Aytoniaceae

Purple-margined LiverwortVU

Purple-margined Liverwort

Reboulia hemisphaerica

Unknown
sibirsepterCR

sibirsepter

Mannia sibirica

Unknown
Fragrant MacewortCR

Fragrant Macewort

Mannia fragrans

Unknown

Threatened in Austria

Calidris ferrugineaVU

Calidris ferruginea

Declining
VU

Large Tree-chernes

Dendrochernes cyrneus

Unknown
VU

Olive Skipper

Pyrgus serratulae

Unknown
SandoldenborreCR

Sandoldenborre

Hoplia graminicola

Unknown

Frequently asked questions

Why is Field Macewort classified as Critically Endangered?
Field Macewort is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. 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.
Where does Field Macewort live?
Field Macewort occurs in Austria, Canada, Croatia, Czechia, Denmark, and Finland (plus 20 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Field Macewort?
The main threats to Field Macewort are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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