North America Native Plant

Texan Pore Lichen

Botanical name: Pertusaria texana

USDA symbol: PETE19

Habit: lichen

Native status: Native to North America  

Texan Pore Lichen: A Tiny Natural Wonder in Your Backyard Have you ever noticed those crusty, whitish patches on tree bark and wondered what they were? You might be looking at Texan pore lichen (Pertusaria texana), a fascinating organism that’s neither plant nor animal, but something wonderfully unique that calls ...

Texan Pore Lichen: A Tiny Natural Wonder in Your Backyard

Have you ever noticed those crusty, whitish patches on tree bark and wondered what they were? You might be looking at Texan pore lichen (Pertusaria texana), a fascinating organism that’s neither plant nor animal, but something wonderfully unique that calls North America home.

What Exactly Is Texan Pore Lichen?

Let’s clear up a common misconception right away – lichens aren’t plants! They’re actually a remarkable partnership between fungi and algae (and sometimes cyanobacteria) working together in perfect harmony. Think of it as nature’s ultimate roommate situation, where everyone benefits and nobody pays rent.

Pertusaria texana belongs to the crustose lichen family, which means it forms thin, crusty patches that seem almost painted onto surfaces. It’s like nature’s graffiti, but way more sophisticated and definitely more welcome!

Where You’ll Find This Native Treasure

This lichen is native to North America, with a particular fondness for Texas and the surrounding southern United States – hence its common name. You’ll typically spot it making itself at home on the bark of various trees, where it lives as a harmless tenant.

What Does Texan Pore Lichen Look Like?

Identifying Texan pore lichen is like being a nature detective. Here’s what to look for:

  • Thin, crusty patches that appear whitish to pale gray
  • Smooth or slightly rough texture that feels almost chalky
  • Grows directly on tree bark, forming irregular patches
  • No leafy or branching structures (remember, it’s crustose!)

Is It Beneficial to Have in Your Garden?

Absolutely! While you can’t exactly plant Texan pore lichen (more on that in a moment), having it show up naturally in your garden is actually a wonderful sign. Here’s why you should welcome this tiny tenant:

  • It’s an indicator of good air quality – lichens are sensitive to pollution
  • Provides microscopic habitat for tiny creatures
  • Adds natural character and biodiversity to your landscape
  • Completely harmless to trees (it’s not a parasite, just a friendly hitchhiker)

Can You Grow Texan Pore Lichen?

Here’s where things get interesting – you can’t actually cultivate lichens like traditional plants. They’re incredibly particular about their growing conditions, requiring just the right combination of air quality, humidity, temperature, and host surface. It’s like trying to convince a cat to take a bath – theoretically possible, but practically impossible!

Instead of trying to grow them, the best approach is to create conditions that might naturally attract them:

  • Maintain mature trees in your landscape
  • Avoid using harsh chemicals or pesticides
  • Keep your garden’s air quality as clean as possible
  • Be patient – lichens are slow growers and may take years to establish

The Bottom Line

Texan pore lichen might not be the showstopper of your garden, but it’s certainly a sign that you’re doing something right environmentally. If you spot these pale, crusty patches on your trees, give yourself a pat on the back – you’re providing habitat for one of nature’s most fascinating partnerships.

Remember, the presence of lichens like Pertusaria texana is often a badge of honor for gardeners who prioritize ecological health. So next time you’re strolling through your garden and notice these unassuming organisms, take a moment to appreciate the complex, beautiful world of nature that’s thriving right under your nose!

Texan Pore Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Pertusariaceae Körb.

Genus

Pertusaria DC. - pore lichen

Species

Pertusaria texana Müll. Arg. - Texan pore lichen

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