North America Native Plant

Byssoloma Meadii

Botanical name: Byssoloma meadii

USDA symbol: BYME

Habit: lichen

Native status: Native to North America  

Synonyms: Bacidia meadii (Tuck.) Zahlbr. (BAME3)   

Byssoloma meadii: The Tiny Lichen You Never Knew Lived in Your Backyard Ever noticed those crusty, grayish patches on tree bark and wondered what they are? You might be looking at Byssoloma meadii, a fascinating little lichen that’s been quietly going about its business in North American forests long before ...

Byssoloma meadii: The Tiny Lichen You Never Knew Lived in Your Backyard

Ever noticed those crusty, grayish patches on tree bark and wondered what they are? You might be looking at Byssoloma meadii, a fascinating little lichen that’s been quietly going about its business in North American forests long before we started paying attention to native species. While this isn’t a plant you can add to your shopping cart at the local nursery, it’s definitely worth getting to know!

What Exactly Is Byssoloma meadii?

First things first – Byssoloma meadii isn’t actually a plant at all. It’s a lichen, which is basically nature’s ultimate roommate situation. This tiny organism is actually two different life forms (a fungus and an algae) living together in perfect harmony on tree bark. You might also see it referred to by its scientific synonym, Bacidia meadii, but don’t let the fancy names intimidate you.

This native North American species calls the eastern parts of the continent home, with a particular fondness for the southeastern United States. It’s one of those quiet natives that has been part of our ecosystems for ages, doing important work without asking for any recognition.

Spotting This Sneaky Lichen

Byssoloma meadii won’t win any beauty contests – it forms small, crusty patches that are easy to overlook. Here’s what to look for:

  • Grayish-white, crusty appearance on tree bark
  • Small, inconspicuous patches that blend with the bark
  • Typically found on deciduous trees in humid forest environments
  • More common in mature forest settings than young woodlands

Is It Good for Your Garden?

While you can’t plant Byssoloma meadii (trust me, it doesn’t work that way), having it show up naturally in your landscape is actually a pretty good sign! Lichens are like nature’s air quality monitors – they’re sensitive to pollution, so their presence suggests you’ve got clean air around your property.

Here’s why you should appreciate this little lichen if it decides to call your trees home:

  • It indicates good air quality in your area
  • Adds to the biodiversity of your local ecosystem
  • Doesn’t harm the trees it grows on
  • Contributes to the complex web of life in forest environments

The Forest Connection

If you’re lucky enough to have mature trees on your property, especially in areas with good humidity and clean air, you might just spot Byssoloma meadii making itself at home. It prefers the bark of deciduous trees and thrives in the kind of stable, mature forest environment that takes decades to develop.

This lichen is part of what makes old-growth and mature forest ecosystems so special. While it might not be as flashy as your favorite native wildflowers, it’s doing important work as part of the intricate community of organisms that keep forest ecosystems healthy and balanced.

A Word of Appreciation

The next time you’re out walking among trees – whether in your backyard, a local park, or a nature preserve – take a moment to look closely at the bark. Those small, crusty patches you see might just be Byssoloma meadii, a native North American lichen that’s been quietly contributing to ecosystem health for generations.

While we can’t cultivate lichens like we do our favorite native plants, we can appreciate them as indicators of environmental health and important players in the complex communities that make our native ecosystems thrive. Sometimes the smallest, most overlooked organisms are doing some of the most important work of all.

Byssoloma Meadii

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Pilocarpaceae Zahlbr.

Genus

Byssoloma Trevis. - byssoloma lichen

Species

Byssoloma meadii (Tuck.) S. Ekman

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