North America Native Plant

Farnoldia Lichen

Botanical name: Farnoldia micropsis

USDA symbol: FAMI

Habit: lichen

Native status: Native to North America  

Synonyms: Lecidea rhaetica Hepp ex Th. Fr. (LERH)  ⚘  Melanolecia micropsis (A. Massal.) Hertel (MEMI7)  ⚘  Tremolecia micropsis (A. Massal.) Hertel (TRMI12)  ⚘  Tremolecia nivalis (Anzi) Hertel (TRNI5)   

Farnoldia Lichen: A Tiny Mountain Marvel You Might Already Have If you’ve ever hiked through mountain trails or examined the rocks in your alpine garden, you might have encountered a small, crusty patch that looks like nature’s version of abstract art. Meet the farnoldia lichen (Farnoldia micropsis), a fascinating organism ...

Farnoldia Lichen: A Tiny Mountain Marvel You Might Already Have

If you’ve ever hiked through mountain trails or examined the rocks in your alpine garden, you might have encountered a small, crusty patch that looks like nature’s version of abstract art. Meet the farnoldia lichen (Farnoldia micropsis), a fascinating organism that’s neither plant nor animal, but something wonderfully in between!

What Exactly Is Farnoldia Lichen?

Here’s where things get interesting: farnoldia lichen isn’t actually a plant at all. It’s a lichen – a remarkable partnership between a fungus and an algae that work together like the ultimate roommates. The fungus provides structure and protection, while the algae photosynthesizes to create food for both. It’s nature’s original collaboration!

This particular lichen species is native to North America and has quite the collection of scientific aliases, including Lecidea rhaetica, Melanolecia micropsis, and Tremolecia micropsis. Scientists love their synonyms almost as much as lichens love their rocky homes.

Where You’ll Find This Mountain Dweller

Farnoldia lichen is a true mountain enthusiast, thriving in the arctic and alpine regions across North America. You’ll typically spot it decorating rock surfaces in high-elevation areas where the air is crisp, clean, and free from pollution.

Spotting Farnoldia Lichen in the Wild

Identifying this little wonder requires looking closely at rocky surfaces. Farnoldia lichen appears as:

  • Small, crusty patches that seem to be painted onto rock surfaces
  • Grayish to brownish coloration that might blend with the stone
  • Relatively small size compared to other lichen species
  • A preference for clean, unpolluted environments

Is Farnoldia Lichen Beneficial for Your Garden?

While you can’t exactly plant farnoldia lichen like you would a tomato, its presence in your garden is actually a wonderful sign! Here’s why:

  • Air quality indicator: Lichens are incredibly sensitive to air pollution, so finding them means your garden enjoys clean, healthy air
  • Natural beauty: They add subtle, artistic touches to stone features, retaining walls, and rock gardens
  • Ecosystem support: While not directly beneficial to pollinators, lichens contribute to the overall biodiversity of your outdoor space
  • Low maintenance: They require absolutely zero care from you – they’re the ultimate independent garden residents

Creating Lichen-Friendly Conditions

You can’t plant farnoldia lichen, but you can certainly encourage it and other lichens to make themselves at home:

  • Include natural stone features like rock gardens or stone walls
  • Avoid using chemical pesticides or fertilizers near rocky areas
  • Ensure good air circulation around stone surfaces
  • Be patient – lichens grow incredibly slowly and appear when conditions are just right

The Bottom Line

Farnoldia lichen might not be the showstopper you’d add to a shopping list, but discovering it in your garden is like finding a tiny treasure. It’s a sign that you’re doing something right environmentally, and it adds a subtle, natural artistry to stone surfaces that no human could replicate.

So next time you’re examining the rocks in your garden or on a mountain hike, take a moment to appreciate these remarkable little partnerships. They’ve been perfecting the art of collaboration long before we humans figured out teamwork, and they’re quietly making our world a more interesting place, one tiny crusty patch at a time.

Farnoldia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Porpidiaceae Hertel & Hafellner

Genus

Farnoldia Hertel - farnoldia lichen

Species

Farnoldia micropsis (A. Massal.) Hertel - farnoldia lichen

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