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Glaucous Beard-moss

Didymodon glaucus

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Overview

Glaucous Beard-moss (Didymodon glaucus) is a small acrocarpous moss characterized by its distinctive blue-green to glaucous coloration and densely packed, linear-lanceolate leaves. This bryophyte forms compact cushions or turfs on calcareous substrates and plays a crucial role in soil stabilization and microhabitat creation for invertebrates in specialized alkaline environments.

Glaucous Beard-moss (Didymodon glaucus) faces severe threats from habitat destruction and degradation of its specialized limestone cliff and rock crevice environments. Urban development, quarrying activities, and recreational climbing have significantly reduced available habitat, while air pollution and climate change alter the delicate microenvironments this moss requires for survival.

Threat summary

Habitat

Didymodon glaucus occurs exclusively on exposed limestone rocks, mortar of old walls, and concrete structures in areas with high calcium carbonate content. It typically colonizes vertical or near-vertical surfaces in partially shaded locations where moisture can accumulate but drainage prevents waterlogging.

Other threatened species in Pottiaceae

VU

Rigid Aloe-moss

Aloina rigida

Unknown
VU

Rufous Beard-moss

Bryoerythrophyllum ferruginascens

Unknown
Heim's PottiaVU

Heim's Pottia

Hennediella heimii

Unknown
VU

Yellow Crisp-moss

Tortella flavovirens

Unknown

Frequently asked questions

Why is Glaucous Beard-moss classified as Critically Endangered?
Glaucous Beard-moss 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. Glaucous Beard-moss (Didymodon glaucus) faces severe threats from habitat destruction and degradation of its specialized limestone cliff and rock crevice environments. Urban development, quarrying activities, and recreational climbing have significantly reduced available habitat, while air pollution and climate change alter the delicate microenvironments this moss requires for survival.
Where does Glaucous Beard-moss live?
Glaucous Beard-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 Glaucous Beard-moss?
The main threats to Glaucous Beard-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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