North America Native Plant

Madagascar Parmotrema Lichen

Botanical name: Parmotrema madagascariaceum

USDA symbol: PAMA20

Habit: lichen

Native status: Native to North America  

Synonyms: Parmelia chrysantha Tuck. (PACH14)  ⚘  Parmelia madagascariacea (Hue) Abbayes (PAMA23)   

Madagascar Parmotrema Lichen: A Natural Air Quality Indicator in Your Landscape Have you ever noticed those large, leafy, grayish-green patches growing on tree bark in your yard? You might be looking at Madagascar parmotrema lichen (Parmotrema madagascariaceum), a fascinating organism that’s actually doing your garden – and you – a ...

Madagascar Parmotrema Lichen: A Natural Air Quality Indicator in Your Landscape

Have you ever noticed those large, leafy, grayish-green patches growing on tree bark in your yard? You might be looking at Madagascar parmotrema lichen (Parmotrema madagascariaceum), a fascinating organism that’s actually doing your garden – and you – a big favor!

What Exactly Is Madagascar Parmotrema Lichen?

First things first: this isn’t a plant you can pop into your shopping cart at the garden center. Madagascar parmotrema lichen is what scientists call a composite organism – basically, it’s a partnership between algae and fungi living together in perfect harmony. Think of it as nature’s original roommate situation, except both parties actually get along and help each other out!

This lichen is also known by its scientific synonyms Parmelia chrysantha and Parmelia madagascariacea, but let’s stick with the friendlier Madagascar parmotrema lichen, shall we?

Where You’ll Find This Lichen

Madagascar parmotrema lichen is native to North America, where it naturally colonizes the bark of various trees. You’ll typically spot it on hardwood trees like oaks, maples, and hickories, where it forms those distinctive large, flat, leaf-like structures that can span several inches across.

How to Identify Madagascar Parmotrema Lichen

Spotting this lichen is easier than you might think once you know what to look for:

  • Large, flat, leaf-like lobes that can grow quite expansive
  • Pale greenish-gray to bluish-gray coloration
  • Smooth or slightly wrinkled surface texture
  • Grows directly on tree bark, typically on the trunk or larger branches
  • Forms irregular, spreading patches that can cover significant portions of bark

Is It Beneficial to Have in Your Landscape?

Absolutely! Having Madagascar parmotrema lichen in your landscape is actually a wonderful sign. Here’s why you should be happy to see it:

  • Air quality indicator: This lichen is sensitive to air pollution, so its presence means your air quality is relatively good
  • Adds natural texture: It creates interesting visual patterns on tree bark without harming the host tree
  • Supports biodiversity: While it doesn’t attract pollinators directly, it contributes to the overall ecosystem complexity of your landscape
  • Low maintenance: It requires absolutely no care from you – nature handles everything!

Can You Grow Madagascar Parmotrema Lichen?

Here’s where things get interesting – you can’t really grow this lichen in the traditional gardening sense. Unlike plants that you can propagate, plant, and nurture, lichens establish themselves naturally when conditions are right. They need clean air, appropriate humidity levels, and suitable host trees to thrive.

The best thing you can do to encourage lichen growth in your landscape is to maintain healthy trees and avoid using harsh chemicals or air pollutants that might discourage their natural establishment.

What If You Don’t Want It?

While Madagascar parmotrema lichen is completely harmless to trees and actually beneficial to your landscape’s ecosystem, some people prefer a cleaner look on their tree bark. If that’s you, remember that removing lichens won’t help your trees, and their presence indicates good environmental conditions. But hey, we get it – everyone has their aesthetic preferences!

The Bottom Line

Madagascar parmotrema lichen is one of those wonderful garden guests that shows up uninvited but brings only good things with it. It’s a sign of healthy air quality, adds natural beauty to your trees, and requires zero effort on your part. Consider yourself lucky if you spot these fascinating organisms making themselves at home in your landscape – they’re telling you that you’re doing something right!

Madagascar Parmotrema Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Parmeliaceae F. Berchtold & J. Presl

Genus

Parmotrema A. Massal. - parmotrema lichen

Species

Parmotrema madagascariaceum (Hue) Hale - Madagascar parmotrema lichen

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