North America Native Plant

Pyxine Lichen

Botanical name: Pyxine berteriana

USDA symbol: PYBE2

Habit: lichen

Native status: Native to North America  

Synonyms: Pyxine meissneri Tuck. (PYME4)   

Pyxine Lichen: The Tiny Garden Guest You Never Invited (But Should Welcome) Have you ever noticed small, crusty patches on your trees that look like they’re wearing tiny gray-green sweaters? Meet the pyxine lichen (Pyxine berteriana), a fascinating little organism that’s probably already made itself at home in your garden ...

Pyxine Lichen: The Tiny Garden Guest You Never Invited (But Should Welcome)

Have you ever noticed small, crusty patches on your trees that look like they’re wearing tiny gray-green sweaters? Meet the pyxine lichen (Pyxine berteriana), a fascinating little organism that’s probably already made itself at home in your garden without you even realizing it!

What Exactly Is Pyxine Lichen?

Before we dive in, let’s clear up a common misconception: lichens aren’t plants at all! They’re actually a remarkable partnership between fungi and algae, working together like the ultimate roommate duo. The pyxine lichen is one of these incredible collaborations, and it’s been quietly doing its thing on tree bark across North America for centuries.

Also known by its scientific synonym Pyxine meissneri, this little lichen is native to North America and particularly loves the warmer, more humid regions of the eastern and southeastern United States.

Where You’ll Find Pyxine Lichen

Pyxine berteriana has made itself comfortable throughout eastern and southeastern North America, thriving in areas with higher humidity and milder temperatures. You’re most likely to spot it in regions where the air stays relatively moist and the climate isn’t too harsh.

Spotting Pyxine Lichen in Your Garden

Think of yourself as a lichen detective! Here’s what to look for:

  • Location: Check the bark of your deciduous trees and shrubs – that’s this lichen’s favorite hangout spot
  • Appearance: Small, crusty to slightly leafy patches with a grayish-green color
  • Texture: Can range from crusty (like a scab, but prettier) to somewhat leafy
  • Size: These are tiny neighbors – don’t expect anything dramatic
  • Reproductive structures: You might spot small, disc-like structures called apothecia if you look closely

Is Pyxine Lichen Good for Your Garden?

Here’s the great news: pyxine lichen is completely harmless to your trees and plants! In fact, it’s kind of like having a tiny environmental health monitor in your garden. Lichens are sensitive to air pollution, so their presence actually indicates that your garden has relatively clean air – pat yourself on the back!

While pyxine lichen doesn’t offer nectar for pollinators (since it doesn’t produce flowers), it does contribute to the overall ecosystem in subtle ways:

  • It helps break down organic matter over very long periods
  • Some small insects and microorganisms use lichens as habitat
  • It adds to the biodiversity of your garden’s micro-ecosystem

Can You Grow Pyxine Lichen?

Here’s where things get interesting – you can’t actually plant or cultivate pyxine lichen like you would a flower or shrub. These little partnerships between fungi and algae establish themselves naturally and grow incredibly slowly. Think of them as the ultimate low-maintenance garden residents!

The best thing you can do is simply maintain a healthy garden environment with:

  • Good air quality (avoid excessive use of chemicals)
  • Appropriate humidity levels
  • Healthy trees and shrubs for them to call home

Living in Harmony with Your Lichen Neighbors

If you discover pyxine lichen in your garden, consider it a compliment to your gardening skills! Its presence suggests you’re maintaining a healthy, balanced environment. There’s no need to remove it – it won’t harm your plants and adds an interesting element to your garden’s natural diversity.

So next time you’re wandering through your garden, take a moment to appreciate these tiny, ancient partnerships quietly doing their thing on your trees. They’re living proof that sometimes the most interesting garden residents are the ones that invite themselves over and decide to stay!

Pyxine Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Physciaceae Zahlbr.

Genus

Pyxine Fr. - pyxine lichen

Species

Pyxine berteriana (Fée) Imshaug - pyxine lichen

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