Blue Tooth
CR

Blue Tooth

Hydnellum caeruleum

Unknown

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

Overview

Hydnellum caeruleum, commonly known as the blue-gray hydnellum, blue-green hydnellum, blue spine, blue tooth, or bluish tooth, is an inedible fungus found in North America, Europe, and temperate areas of Asia.

Hydnellum caeruleum, the Blue Tooth fungus, faces severe decline primarily due to habitat loss from deforestation and agricultural conversion of old-growth forests where it forms essential mycorrhizal relationships. Air pollution, particularly nitrogen deposition, disrupts the delicate soil chemistry required for this species' survival. Climate change further threatens its specialized ecological niche by altering temperature and moisture conditions in its forest habitat.

Threat summary

Habitat

Hydnellum caeruleum is mycorrhizal and often found in the humus beneath conifer trees.

H. caeruleum is an ectomycorrhizal fungus native to temperate regions of Asia, Europe, and North America. The species is commonly found in pine and spruce ecosystems due to its mycorrhizal relationships with coniferous trees.

A study on stipitate hydnoid fungi in Scottish coniferous forests, which focused on...

TERRESTRIAL· major

Frequently asked questions

Why is Blue Tooth classified as Critically Endangered?
Blue Tooth 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. Hydnellum caeruleum, the Blue Tooth fungus, faces severe decline primarily due to habitat loss from deforestation and agricultural conversion of old-growth forests where it forms essential mycorrhizal relationships. Air pollution, particularly nitrogen deposition, disrupts the delicate soil chemistry required for this species' survival. Climate change further threatens its specialized ecological niche by altering temperature and moisture conditions in its forest habitat.
Where does Blue Tooth live?
Blue Tooth occurs in Austria, Bahrain, Belarus, Belgium, Canada, and China (plus 33 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Blue Tooth?
The main threats to Blue Tooth 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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