Giant Spear-moss
VU

Giant Spear-moss

Calliergon giganteum

UnknownLCEULCEU

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Calliergon_giganteum

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Giant Spear-moss faces severe decline due to habitat drainage and agricultural conversion of its wetland environments. Climate change compounds these pressures by altering precipitation patterns and increasing drought frequency in its specialized bog and fen habitats. Water pollution from agricultural runoff and urban development further degrades the pristine conditions this species requires for survival.

Threat summary

Habitat

Giant Spear-moss inhabits nutrient-poor wetlands including bogs, fens, and marshy areas with consistently high water tables. It thrives in acidic to neutral pH conditions and requires clean, mineral-poor water with minimal disturbance.

FRESHWATER· major

Other threatened species in Calliergonaceae

Heart-leaved Spear-mossVU

Heart-leaved Spear-moss

Calliergon cordifolium

Unknown
VU

spring hook moss

Warnstorfia pseudostraminea

Unknown
VU

grootbladig puntmos

Calliergon megalophyllum

Unknown
Floating Hook-mossEN

Floating Hook-moss

Warnstorfia fluitans

Unknown

Frequently asked questions

Why is Giant Spear-moss classified as Vulnerable?
Giant Spear-moss is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Giant Spear-moss faces severe decline due to habitat drainage and agricultural conversion of its wetland environments. Climate change compounds these pressures by altering precipitation patterns and increasing drought frequency in its specialized bog and fen habitats. Water pollution from agricultural runoff and urban development further degrades the pristine conditions this species requires for survival.
Where does Giant Spear-moss live?
Giant Spear-moss occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Giant Spear-moss?
The main threats to Giant Spear-moss 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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