Witches' Whiskers Lichen
VU

Witches' Whiskers Lichen

Usnea florida

Unknown

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

Overview

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

Witches' Whiskers Lichen faces severe decline from air pollution, particularly sulfur dioxide and nitrogen compounds that directly damage its sensitive thallus structure. Habitat fragmentation through deforestation and urban development eliminates the old-growth trees this epiphytic species requires for attachment and growth. Climate change compounds these pressures by altering precipitation patterns and increasing temperature extremes that stress this moisture-dependent lichen.

Threat summary

Habitat

This epiphytic lichen grows exclusively on the bark of mature deciduous and coniferous trees in old-growth and semi-natural forests, particularly favoring oak, maple, and pine species. It requires clean air environments with high humidity and is typically found in undisturbed woodland areas away from industrial pollution sources.

TERRESTRIAL· major

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Frequently asked questions

Why is Witches' Whiskers Lichen classified as Vulnerable?
Witches' Whiskers Lichen 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. Witches' Whiskers Lichen faces severe decline from air pollution, particularly sulfur dioxide and nitrogen compounds that directly damage its sensitive thallus structure. Habitat fragmentation through deforestation and urban development eliminates the old-growth trees this epiphytic species requires for attachment and growth. Climate change compounds these pressures by altering precipitation patterns and increasing temperature extremes that stress this moisture-dependent lichen.
Where does Witches' Whiskers Lichen live?
Witches' Whiskers Lichen 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 Witches' Whiskers Lichen?
The main threats to Witches' Whiskers Lichen 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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