North America Native Plant

Mycomicrothelia Lichen

Botanical name: Mycomicrothelia dothideaspora

USDA symbol: MYDO

Habit: lichen

Native status: Native to North America  

Mycomicrothelia Lichen: A Tiny North American Native Worth Knowing If you’ve ever wondered about those crusty, seemingly lifeless patches you might spot on tree bark or rocks, you might be looking at something far more fascinating than you realize. Meet the mycomicrothelia lichen (Mycomicrothelia dothideaspora), a small but remarkable organism ...

Mycomicrothelia Lichen: A Tiny North American Native Worth Knowing

If you’ve ever wondered about those crusty, seemingly lifeless patches you might spot on tree bark or rocks, you might be looking at something far more fascinating than you realize. Meet the mycomicrothelia lichen (Mycomicrothelia dothideaspora), a small but remarkable organism that’s quietly doing important work in North American ecosystems.

What Exactly Is Mycomicrothelia Lichen?

First things first – lichens aren’t plants! They’re actually a fascinating partnership between fungi and algae (or sometimes cyanobacteria) living together in perfect harmony. Think of it as nature’s ultimate roommate situation, where both parties benefit from the arrangement. The mycomicrothelia lichen is what scientists call a crustose lichen, meaning it forms a thin, crusty layer that’s tightly attached to whatever surface it calls home.

Where You’ll Find This Native Beauty

This little lichen is a true North American native, though specific details about its exact range and preferred habitats are still being studied by researchers. Like many lichens, it’s likely found across various regions of the continent, quietly going about its business on tree bark, rocks, or other suitable surfaces.

Is It Good for Your Garden?

Here’s where things get interesting! While you can’t exactly plant mycomicrothelia lichen like you would a flower or shrub, having lichens in your garden is actually a wonderful sign. Here’s why:

  • They’re excellent indicators of clean air – lichens are sensitive to pollution, so their presence means your garden has good air quality
  • They add subtle texture and natural character to tree bark and rock surfaces
  • They’re part of the complex web of life that supports healthy ecosystems
  • Some wildlife species use lichens for nesting material or food

How to Identify Mycomicrothelia Lichen

Spotting this particular lichen requires a keen eye and possibly a magnifying glass! As a crustose lichen, it forms thin, crust-like patches that are firmly attached to its substrate. Without diving too deep into technical details, look for small, dark-colored crusty growths that seem to be part of the surface they’re growing on rather than sitting on top of it.

Creating a Lichen-Friendly Garden

While you can’t plant lichens directly, you can certainly create conditions that welcome them:

  • Avoid using pesticides and chemicals that might harm these sensitive organisms
  • Leave some natural surfaces like tree bark and rocks undisturbed
  • Maintain good air quality around your property
  • Be patient – lichens grow very slowly and establish naturally over time

The Bottom Line

Mycomicrothelia lichen might not be the showstopper of your garden, but it’s a fascinating example of the incredible diversity of life that can thrive in our native landscapes. Rather than trying to cultivate it, appreciate it as a sign of a healthy ecosystem and clean environment. Next time you’re out in your garden, take a moment to look closely at the surfaces around you – you might just discover a whole world of lichens you never noticed before!

Remember, the best gardens work with nature rather than against it, and welcoming native organisms like lichens is just one more way to create a truly sustainable and ecologically valuable outdoor space.

Mycomicrothelia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Dothideales

Family

Arthopyreniaceae Walt. Watson

Genus

Mycomicrothelia Keissler - mycomicrothelia lichen

Species

Mycomicrothelia dothideaspora (Cooke & Harkness) D. Hawksw. - mycomicrothelia lichen

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