North America Native Plant

Ocellularia Lichen

Botanical name: Ocellularia auberiana

USDA symbol: OCAU

Habit: lichen

Native status: Native to North America  

Synonyms: Leptotrema auberianum (Mont.) Fink (LEAU9)   

Ocellularia Lichen: A Fascinating Natural Garden Visitor You Can’t Plant If you’ve ever noticed small, crusty patches on tree bark in your garden and wondered what they are, you might be looking at a lichen! One particularly interesting species native to North America is Ocellularia auberiana, commonly known as ocellularia ...

Ocellularia Lichen: A Fascinating Natural Garden Visitor You Can’t Plant

If you’ve ever noticed small, crusty patches on tree bark in your garden and wondered what they are, you might be looking at a lichen! One particularly interesting species native to North America is Ocellularia auberiana, commonly known as ocellularia lichen. But here’s the twist – this isn’t something you can plant or buy at your local nursery.

What Exactly Is Ocellularia Lichen?

Ocellularia auberiana isn’t actually a plant at all – it’s a lichen! Lichens are fascinating organisms that are part fungus and part algae (or sometimes cyanobacteria), living together in a mutually beneficial partnership. Think of it as nature’s ultimate roommate situation, where both partners help each other survive.

This particular lichen species is also known by its scientific synonym Leptotrema auberianum, but don’t worry about remembering that mouthful – ocellularia lichen works just fine!

Where You’ll Find This Native Beauty

As a species native to North America, ocellularia lichen naturally occurs in the southeastern United States, particularly in Florida and along the Gulf Coast states. It’s perfectly at home in our humid, warm climates where it can thrive on the bark of various trees.

Spotting Ocellularia Lichen in Your Garden

Here’s how to identify this unique organism if it shows up in your landscape:

  • Look for whitish to pale gray crusty patches on tree bark
  • Notice the distinctive oval-shaped structures (called perithecia) that contain the lichen’s reproductive parts
  • It appears as a relatively flat, encrusting growth on the surface of bark
  • Most commonly found on mature trees in areas with good air quality

Is It Beneficial to Have in Your Garden?

Absolutely! While you can’t plant ocellularia lichen, having it appear naturally in your garden is actually a great sign. Here’s why you should be happy to see it:

  • It indicates good air quality in your area (lichens are sensitive to air pollution)
  • It doesn’t harm your trees – it’s an epiphyte that just uses the bark as a surface to live on
  • It adds to the biodiversity of your garden ecosystem
  • Some wildlife may use lichens as nesting material

The Reality About Growing Lichens

Here’s where we need to set expectations straight – you simply cannot plant, buy, or cultivate ocellularia lichen. Lichens establish themselves naturally when conditions are right, which includes:

  • High humidity levels
  • Clean, unpolluted air
  • Suitable host trees
  • Time – lots and lots of time (lichens grow incredibly slowly)

Instead of trying to grow lichens, the best thing you can do is create conditions that might encourage them to appear naturally by maintaining mature trees, avoiding excessive use of chemicals, and supporting overall air quality in your area.

What This Means for Your Native Garden

If ocellularia lichen appears in your garden naturally, consider yourself lucky! It’s a sign that you’re providing a healthy habitat for native organisms. While you can’t add it to your shopping list, you can focus on planting native trees and shrubs that might eventually become hosts for this and other beneficial lichens.

The presence of native lichens like Ocellularia auberiana adds another layer of authenticity to your native landscape, connecting your garden to the broader ecosystem in ways that go far beyond traditional gardening. Sometimes the best garden residents are the ones that choose you!

Ocellularia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Graphidales

Family

Thelotremataceae Stizenb.

Genus

Ocellularia G. Mey. - ocellularia lichen

Species

Ocellularia auberiana (Mont.) Hale - ocellularia lichen

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