VU

twijgvlekje

Arthonia punctiformis

Unknown

Overview

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

Arthonia punctiformis faces severe decline due to air pollution, particularly nitrogen deposition and sulfur dioxide emissions that alter bark chemistry and reduce suitable substrate availability. The species is highly sensitive to atmospheric changes that affect the pH and nutrient composition of tree bark, making it vulnerable to industrial emissions and urban air quality degradation. Habitat fragmentation of old-growth forests further restricts colonization opportunities for this slow-dispersing lichen species.

Threat summary

Habitat

This crustose lichen species inhabits the bark of mature deciduous and coniferous trees in old-growth and semi-natural forests, particularly favoring trees with smooth to moderately rough bark in humid, sheltered woodland environments. It requires stable microclimatic conditions with consistent moisture levels and minimal air pollution exposure.

TERRESTRIAL· major

Other threatened species in Arthoniaceae

WitkringCR

Witkring

Sporodophoron cretaceum

Unknown
VU

tornflekklav

Arthonia ilicina

Unknown
Arthonia vinosaVU

Arthonia vinosa

Unknown
VU

stjerneflekklav

Arthonia stellaris

Unknown

Frequently asked questions

Why is twijgvlekje classified as Vulnerable?
twijgvlekje 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. Arthonia punctiformis faces severe decline due to air pollution, particularly nitrogen deposition and sulfur dioxide emissions that alter bark chemistry and reduce suitable substrate availability. The species is highly sensitive to atmospheric changes that affect the pH and nutrient composition of tree bark, making it vulnerable to industrial emissions and urban air quality degradation. Habitat fragmentation of old-growth forests further restricts colonization opportunities for this slow-dispersing lichen species.
Where does twijgvlekje live?
twijgvlekje 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 twijgvlekje?
The main threats to twijgvlekje 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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