Heart-leaved Spear-moss
VU

Heart-leaved Spear-moss

Calliergon cordifolium

UnknownLCEULCEU

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

Overview

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

Heart-leaved Spear-moss faces severe decline due to wetland drainage and agricultural conversion of its specialized bog and fen habitats. Water table alterations from nearby development and climate-induced changes to precipitation patterns disrupt the precise hydrological conditions this species requires. Eutrophication from agricultural runoff and atmospheric nitrogen deposition further degrades the nutrient-poor conditions essential for its survival.

Threat summary

Habitat

Heart-leaved Spear-moss inhabits minerotrophic wetlands including calcareous fens, rich bogs, and wet meadows with consistent groundwater flow. It requires nutrient-poor to moderately nutrient-rich conditions with stable water levels and alkaline to neutral pH.

Other threatened species in Calliergonaceae

VU

spring hook moss

Warnstorfia pseudostraminea

Unknown
Giant Spear-mossVU

Giant Spear-moss

Calliergon giganteum

Unknown
VU

grootbladig puntmos

Calliergon megalophyllum

Unknown
Floating Hook-mossEN

Floating Hook-moss

Warnstorfia fluitans

Unknown

Frequently asked questions

Why is Heart-leaved Spear-moss classified as Vulnerable?
Heart-leaved 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. Heart-leaved Spear-moss faces severe decline due to wetland drainage and agricultural conversion of its specialized bog and fen habitats. Water table alterations from nearby development and climate-induced changes to precipitation patterns disrupt the precise hydrological conditions this species requires. Eutrophication from agricultural runoff and atmospheric nitrogen deposition further degrades the nutrient-poor conditions essential for its survival.
Where does Heart-leaved Spear-moss live?
Heart-leaved 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 Heart-leaved Spear-moss?
The main threats to Heart-leaved 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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