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Slender Bristle-moss

Orthotrichum tenellum

UnknownLCEULCEU

Overview

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

Slender Bristle-moss faces severe decline due to air pollution, particularly nitrogen deposition and sulfur compounds that alter the bark chemistry of its host trees. Urban development and intensive agriculture have eliminated many suitable woodland habitats, while climate change is shifting precipitation patterns that this moisture-dependent species requires for reproduction and survival.

Threat summary

Habitat

This epiphytic moss grows exclusively on the bark of deciduous trees, particularly favoring smooth-barked species like ash, elder, and sycamore in humid woodland environments. It requires stable moisture conditions and clean air, typically found in ancient woodlands and well-established parklands with minimal atmospheric pollution.

TERRESTRIAL· major

Other threatened species in Orthotrichaceae

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Macromitrium tocaremae

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Macromitrium attenuatum

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Orthotric de Roger

Orthotrichum rogeri

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xerophytic limestone moss

Orthotrichum pellucidum

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Frequently asked questions

Why is Slender Bristle-moss classified as Endangered?
Slender Bristle-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. Slender Bristle-moss faces severe decline due to air pollution, particularly nitrogen deposition and sulfur compounds that alter the bark chemistry of its host trees. Urban development and intensive agriculture have eliminated many suitable woodland habitats, while climate change is shifting precipitation patterns that this moisture-dependent species requires for reproduction and survival.
Where does Slender Bristle-moss live?
Slender Bristle-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 Slender Bristle-moss?
The main threats to Slender Bristle-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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