VU

Fries' dotted lichen

Bacidia friesiana

Unknown

Overview

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

Bacidia friesiana faces severe decline due to air pollution, particularly nitrogen deposition and sulfur compounds that alter the chemical composition of its bark substrates. Forest management practices that favor younger tree stands reduce the availability of mature bark surfaces essential for this lichen's establishment. Climate change compounds these pressures by altering moisture regimes and temperature patterns that affect both the lichen and its host trees.

Threat summary

Habitat

This epiphytic lichen grows exclusively on the bark of mature deciduous trees, particularly favoring old oak, ash, and maple trees in ancient woodlands and parklands. It requires stable, humid microclimates with minimal air pollution and thrives in areas with consistent moisture levels and filtered light conditions.

TERRESTRIAL· major

Other threatened species in Ramalinaceae

EN

Laurer's Catillaria

Megalaria laureri

Unknown
VU

Megalaria pulverea

Unknown
CR

Ramalina protensa

Unknown
circumspect dotted lichenCR

circumspect dotted lichen

Bacidia circumspecta

Unknown

Frequently asked questions

Why is Fries' dotted lichen classified as Vulnerable?
Fries' dotted 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. Bacidia friesiana faces severe decline due to air pollution, particularly nitrogen deposition and sulfur compounds that alter the chemical composition of its bark substrates. Forest management practices that favor younger tree stands reduce the availability of mature bark surfaces essential for this lichen's establishment. Climate change compounds these pressures by altering moisture regimes and temperature patterns that affect both the lichen and its host trees.
Where does Fries' dotted lichen live?
Fries' dotted 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 Fries' dotted lichen?
The main threats to Fries' dotted 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.

Get weekly conservation intelligence

One short digest a week of the most striking species and country data we ship, plus breaking conservation news paired with our database where it matters.

Free, no spam. One-click unsubscribe in every email.