Boreal Oakmoss Lichen
Evernia mesomorpha
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Evernia_mesomorpha
Overview
Boreal Oakmoss Lichen (Evernia mesomorpha) is a fruticose lichen that forms distinctive pale greenish-gray, branching tufts hanging from tree branches in northern forests. This epiphytic species plays a crucial ecological role as an indicator of air quality and provides nesting material for birds while contributing to forest biodiversity through its symbiotic relationship between fungi and algae.
Boreal Oakmoss Lichen faces significant threats from air pollution, particularly sulfur dioxide and nitrogen compounds, which severely impact lichen growth and survival. Climate change is altering precipitation patterns and temperature regimes in boreal forests, while habitat loss from logging and forest fragmentation reduces available substrate trees and disrupts the stable microclimatic conditions this species requires.
Habitat
Boreal and subalpine coniferous forests, growing epiphytically on the bark and branches of trees, particularly conifers such as spruce, fir, and pine. Requires humid, stable microclimatic conditions with clean air quality typical of undisturbed northern forest ecosystems.
Other threatened species in Parmeliaceae
Frequently asked questions
Why is Boreal Oakmoss Lichen classified as Vulnerable?
Where does Boreal Oakmoss Lichen live?
What are the main threats to Boreal Oakmoss Lichen?
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