North America Native Plant

Arthothelium Lichen

Botanical name: Arthothelium albovirescens

USDA symbol: ARAL19

Habit: lichen

Native status: Native to North America  

Arthothelium Lichen: A Mysterious North American Native If you’ve stumbled across the name arthothelium lichen (Arthothelium albovirescens) in your quest to learn about native species, you’ve encountered quite the botanical mystery! This obscure organism represents one of those fascinating cases where nature still holds secrets, even in our well-documented modern ...

Arthothelium Lichen: A Mysterious North American Native

If you’ve stumbled across the name arthothelium lichen (Arthothelium albovirescens) in your quest to learn about native species, you’ve encountered quite the botanical mystery! This obscure organism represents one of those fascinating cases where nature still holds secrets, even in our well-documented modern world.

What Exactly Is Arthothelium Lichen?

Lichens are some of the most remarkable organisms on Earth – they’re actually a partnership between fungi and algae (and sometimes bacteria too!). Think of them as nature’s ultimate roommates, working together to create something neither could achieve alone. The fungal partner provides structure and protection, while the algae partner produces food through photosynthesis.

Arthothelium albovirescens belongs to the lichen world, specifically noted as being native to North America. However, here’s where things get interesting – and a bit puzzling.

The Mystery Behind This Species

While Arthothelium is indeed a recognized genus of lichens, finding specific, reliable information about A. albovirescens proves surprisingly challenging. This could mean several things:

  • It might be an extremely rare or recently discovered species
  • The scientific name might need verification or updating
  • It could be a regional variant that hasn’t been extensively studied

Are Lichens Beneficial in Your Garden?

Absolutely! Even if we can’t pin down the specifics of this particular arthothelium lichen, lichens in general are garden superstars. Here’s why you should welcome these fascinating organisms:

  • Air quality indicators: Lichens are like natural air quality monitors – they’re sensitive to pollution, so their presence often indicates clean air
  • Soil builders: Over time, lichens help break down rocks and organic matter, contributing to soil formation
  • Wildlife habitat: Many birds use lichens for nesting material, and some animals browse on them
  • Natural beauty: Lichens add subtle colors and textures to trees, rocks, and other surfaces

How to Identify Lichens in Your Landscape

Since specific identification details for A. albovirescens aren’t readily available, here are general tips for spotting lichens in your garden:

  • Look for crusty, leafy, or branching growths on tree bark, rocks, or soil
  • Colors can range from gray and white to bright orange, yellow, or green
  • They often appear after rain when they’re hydrated and more colorful
  • Unlike moss, lichens don’t have true roots, stems, or leaves

Supporting Lichens in Your Native Garden

The best way to encourage lichens like arthothelium lichen in your landscape is to:

  • Avoid using pesticides and herbicides that can harm these sensitive organisms
  • Leave some natural surfaces like tree bark and rocks undisturbed
  • Maintain good air quality around your property
  • Be patient – lichens grow very slowly but are incredibly long-lived

The Bottom Line

While Arthothelium albovirescens remains something of an enigma in the botanical world, it represents the incredible diversity of native North American species that we’re still learning about. If you spot what you think might be this particular lichen, consider reaching out to local mycological societies or university botany departments – you might be contributing to our understanding of this mysterious organism!

In the meantime, celebrating and protecting all the lichens in your landscape is a wonderful way to support native biodiversity, even when we can’t identify every species with certainty.

Arthothelium Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Uncertain Ascomycota Class

Subclass
Order

Uncertain Ascomycota Order

Family

Uncertain Ascomycota Family

Genus

Arthothelium A. Massal. - arthothelium lichen

Species

Arthothelium albovirescens (Nyl.) Fink - arthothelium lichen

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA