Chalk Comb-moss
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Chalk Comb-moss

Ctenidium molluscum

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

Overview

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

Ctenidium molluscum faces severe decline due to habitat degradation from atmospheric pollution, particularly nitrogen deposition and acid rain, which alter the chemical composition of its specialized bryophyte communities. Urban development and agricultural intensification have fragmented its remaining populations, while climate change threatens the cool, humid microclimates essential for this moss's survival. The species' extremely slow growth rate and limited dispersal ability make recovery from disturbances exceptionally difficult.

Threat summary

Habitat

This moss species inhabits calcareous substrates in old-growth woodlands, particularly on limestone outcrops, tree bases, and undisturbed forest floors with consistent moisture levels. It requires stable, shaded environments with minimal disturbance and specific pH conditions maintained by its calcium-rich substrate.

Frequently asked questions

Why is Chalk Comb-moss classified as Endangered?
Chalk Comb-moss is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. Ctenidium molluscum faces severe decline due to habitat degradation from atmospheric pollution, particularly nitrogen deposition and acid rain, which alter the chemical composition of its specialized bryophyte communities. Urban development and agricultural intensification have fragmented its remaining populations, while climate change threatens the cool, humid microclimates essential for this moss's survival. The species' extremely slow growth rate and limited dispersal ability make recovery from disturbances exceptionally difficult.
Where does Chalk Comb-moss live?
Chalk Comb-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 Chalk Comb-moss?
The main threats to Chalk Comb-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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