North America Native Plant

Star Coccocarpia Lichen

Botanical name: Coccocarpia stellata

USDA symbol: COST15

Habit: lichen

Native status: Native to North America  

Synonyms: Coccocarpia asterella (Nyl.) Vain. (COAS5)  ⚘  Parmeliella stellata (Tuck.) Zahlbr. (PAST19)   

Star Coccocarpia Lichen: A Fascinating Forest Dweller You Can’t Grow (But Should Appreciate!) If you’ve ever wandered through a mature forest and noticed intricate, star-like patterns decorating tree bark, you might have encountered the star coccocarpia lichen (Coccocarpia stellata). This fascinating organism isn’t actually a plant at all – it’s ...

Star Coccocarpia Lichen: A Fascinating Forest Dweller You Can’t Grow (But Should Appreciate!)

If you’ve ever wandered through a mature forest and noticed intricate, star-like patterns decorating tree bark, you might have encountered the star coccocarpia lichen (Coccocarpia stellata). This fascinating organism isn’t actually a plant at all – it’s a lichen, which makes it a completely different category of life that’s both mysterious and wonderful.

What Exactly Is Star Coccocarpia Lichen?

Here’s where things get really interesting: lichens aren’t plants, animals, or fungi alone. They’re actually a partnership between fungi and algae (or sometimes cyanobacteria) living together in perfect harmony. The star coccocarpia lichen gets its name from its distinctive stellate, or star-shaped, growth pattern that creates beautiful rosettes on tree bark.

You might also see this species referred to by its scientific synonyms Coccocarpia asterella or Parmeliella stellata in older field guides, but Coccocarpia stellata is the currently accepted name.

Where Can You Find It?

Star coccocarpia lichen is native to North America, with populations scattered throughout the eastern regions of the continent. You’ll typically find it in humid, mature forests where the air quality is good and moisture levels remain relatively high throughout the year.

Why You Can’t (And Shouldn’t Try to) Grow It

Here’s the thing about lichens – they’re incredibly picky about their environment, and star coccocarpia lichen is no exception. Unlike the plants we’re used to growing in our gardens, you simply cannot cultivate lichens. They require:

  • Specific air quality conditions
  • Precise humidity levels
  • The right host trees
  • Undisturbed forest ecosystems
  • Years or even decades to establish

Attempting to transplant or cultivate lichens almost always results in their death, so it’s best to admire them in their natural habitat.

How to Identify Star Coccocarpia Lichen

When you’re out on nature walks, here’s what to look for:

  • Small, star-shaped rosettes growing on tree bark
  • Grayish-green coloration
  • Distinctive stellate (radiating) pattern
  • Typically found on the bark of deciduous trees in humid forests
  • Often grows alongside other lichen species

Is It Beneficial to Have Around?

Absolutely! While you can’t invite star coccocarpia lichen into your garden, having it in nearby natural areas is fantastic news. Lichens are excellent indicators of air quality – their presence suggests that your local ecosystem is healthy and relatively unpolluted. They also:

  • Provide food and nesting material for various wildlife species
  • Help with nutrient cycling in forest ecosystems
  • Contribute to the overall biodiversity of their habitat
  • Serve as natural air quality monitors

What This Means for Your Garden

While you can’t grow star coccocarpia lichen in your landscape, its presence in nearby forests is a sign of a healthy local environment. If you want to support the ecosystems where these lichens thrive, consider:

  • Reducing air pollution by choosing eco-friendly practices
  • Supporting local forest conservation efforts
  • Avoiding the use of harmful chemicals that could affect air quality
  • Creating wildlife corridors that connect your garden to natural areas

The next time you’re hiking through a mature forest, take a moment to appreciate these remarkable organisms. Star coccocarpia lichen may not be something you can add to your garden wish list, but it’s definitely worth adding to your nature observation bucket list!

Star Coccocarpia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Coccocarpiaceae Henssen

Genus

Coccocarpia Pers. - coccocarpia lichen

Species

Coccocarpia stellata Tuck. - star coccocarpia lichen

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