Native Plants

Farnoldia Lichen

Farnoldia micropsis

USDA symbol: FAMI

North America: native

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! ...

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 micropsis is also known as...

Often we refer to plants by their common names. When shopping for plants the scientific name is the best way to positively identify the plant species you desire. But some plants have more than one name! While it doesn't happen often, nurseries might display one name while you're searching for another. Farnoldia micropsis is also known as:

Lecidea rhaetica Hepp ex | USDA symbol: LERH
Melanolecia micropsis | USDA symbol: MEMI7
Tremolecia micropsis | USDA symbol: TRMI12
Tremolecia nivalis | USDA symbol: TRNI5

Why do some plants have more than one name? Over time plant species may be renamed for a few reasons:

  1. Botanists in different regions named the same plant without knowing it had already been classified.
  2. A species was reclassified after scientific advances in, for example, DNA analysis.
  3. Slight variations within a species are sometimes mistakenly identified as entirely new species.

Classification

Group: Lichen
Kingdom: Fungi - Fungi
Division: Ascomycota - Sac fungi
Class: Ascomycetes
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