North America Native Plant

Myrionora

Botanical name: Myrionora albidula

USDA symbol: MYAL8

Habit: lichen

Native status: Native to North America  

Synonyms: Biatorella albidula (Willey) Zahlbr. (BIAL2)   

Myrionora: The Tiny Lichen That’s Quietly Helping Your Garden Ever noticed small, crusty white or grayish patches on tree bark in your yard? You might be looking at myrionora (Myrionora albidula), a fascinating little lichen that’s doing more for your garden ecosystem than you might realize. While most gardeners focus ...

Myrionora: The Tiny Lichen That’s Quietly Helping Your Garden

Ever noticed small, crusty white or grayish patches on tree bark in your yard? You might be looking at myrionora (Myrionora albidula), a fascinating little lichen that’s doing more for your garden ecosystem than you might realize. While most gardeners focus on colorful flowers and lush foliage, these humble organisms are working behind the scenes as nature’s air quality monitors.

What Exactly Is Myrionora?

Let’s clear up any confusion right away – myrionora isn’t a plant you can buy at the nursery or sow from seed. It’s actually a lichen, which is a remarkable partnership between a fungus and algae (or sometimes cyanobacteria). Think of it as nature’s ultimate roommate situation, where both partners benefit from living together.

Myrionora albidula belongs to a group of crustose lichens, meaning they form thin, crusty patches that seem almost painted onto tree bark. These hardy little organisms are native to North America and can be found across temperate regions of the continent.

Spotting Myrionora in Your Garden

Identifying myrionora is pretty straightforward once you know what to look for:

  • Small, whitish to pale gray crusty patches on tree bark
  • Thin, closely adhering to the bark surface
  • Often found alongside other lichen species
  • More common on mature trees with textured bark
  • Typically appears in areas with relatively clean air

You won’t find myrionora on young, smooth-barked trees or in heavily polluted areas – which brings us to why you should actually be happy to see it.

Why Myrionora Is Good News for Your Garden

Here’s the cool part: finding myrionora and other lichens in your garden is actually a positive sign! These sensitive organisms are like living air quality meters. They absorb moisture and nutrients directly from the air, so they can only thrive where the air is relatively clean. If you’ve got healthy lichen populations, it’s a good indication that your garden environment is in decent shape.

While myrionora doesn’t attract pollinators (lichens don’t flower), it does contribute to the overall ecosystem health in subtle ways:

  • Provides microscopic habitat for tiny insects and other organisms
  • Helps with nutrient cycling as it slowly breaks down
  • Adds textural diversity to tree bark ecosystems
  • Serves as an indicator species for environmental monitoring

Can You Encourage Myrionora in Your Garden?

You can’t plant myrionora like you would a tomato or a rose bush, but you can create conditions that make it more likely to establish naturally. The key is maintaining good air quality and providing suitable host surfaces:

  • Avoid using chemical pesticides and fertilizers that might affect air quality
  • Plant a variety of trees with different bark textures
  • Allow mature trees to remain in your landscape when possible
  • Reduce pollution sources around your property
  • Be patient – lichens grow very slowly and establish on their own timeline

Living with Lichens

Some gardeners worry that lichens might harm their trees, but rest assured – myrionora and its lichen relatives are not parasites. They don’t penetrate into living tree tissue or steal nutrients from their host trees. They’re simply using the bark as a place to live while they make their own food through photosynthesis (thanks to their algae partners).

If you’re lucky enough to have myrionora showing up in your garden naturally, consider it a compliment to your environmental stewardship. These little crusty patches might not win any beauty contests, but they’re quietly contributing to the complex web of life that makes a truly healthy garden ecosystem.

So next time you’re wandering through your yard, take a moment to appreciate these tiny, unassuming organisms. They may be small, but they’re proof that your garden is providing clean air and habitat for some of nature’s most interesting partnerships.

Myrionora

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Lecanoraceae Körb.

Genus

Myrionora R.C. Harris - myrionora

Species

Myrionora albidula (Willey) R.C. Harris - myrionora

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