VU

Arthothelium norvegicum

Local name: trønderflekklav

Unknown

Overview

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

Arthothelium norvegicum faces severe pressure from air pollution, particularly nitrogen deposition and sulfur compounds that alter bark chemistry and reduce suitable substrate availability. Climate change poses an additional threat through altered precipitation patterns and temperature fluctuations that affect the delicate moisture balance required for this epiphytic lichen. Forest management practices, including selective logging of old-growth trees that provide optimal bark substrates, further restrict available habitat for this specialized species.

Threat summary

Habitat

This epiphytic lichen grows exclusively on the bark of old deciduous trees, particularly in humid coastal and montane forests of Norway. It requires specific bark chemistry conditions and stable moisture levels found in mature forest ecosystems with minimal air pollution exposure.

TERRESTRIAL· major

Other threatened species in Arthoniaceae

WitkringCR

Witkring

Sporodophoron cretaceum

Unknown
VU

tornflekklav

Arthonia ilicina

Unknown
VU

twijgvlekje

Arthonia punctiformis

Unknown
Arthonia vinosaVU

Arthonia vinosa

Unknown

Frequently asked questions

Why is trønderflekklav classified as Vulnerable?
trønderflekklav 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. Arthothelium norvegicum faces severe pressure from air pollution, particularly nitrogen deposition and sulfur compounds that alter bark chemistry and reduce suitable substrate availability. Climate change poses an additional threat through altered precipitation patterns and temperature fluctuations that affect the delicate moisture balance required for this epiphytic lichen. Forest management practices, including selective logging of old-growth trees that provide optimal bark substrates, further restrict available habitat for this specialized species.
Where does trønderflekklav live?
trønderflekklav 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 trønderflekklav?
The main threats to trønderflekklav 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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