North America Native Plant

Bactrospora Lichen

Botanical name: Bactrospora patellarioides

USDA symbol: BAPA6

Habit: lichen

Native status: Native to North America  

Synonyms: Bacidia clementis Hasse (BACL)  ⚘  Lecanactis patellarioides (Nyl.) Vain. (LEPA27)   

Bactrospora Lichen: The Tiny Garden Guest You Never Planted Have you ever noticed small, crusty patches on the bark of trees in your yard and wondered what they are? You might be looking at bactrospora lichen (Bactrospora patellarioides), a fascinating organism that’s neither plant nor animal, but something wonderfully in ...

Bactrospora Lichen: The Tiny Garden Guest You Never Planted

Have you ever noticed small, crusty patches on the bark of trees in your yard and wondered what they are? You might be looking at bactrospora lichen (Bactrospora patellarioides), a fascinating organism that’s neither plant nor animal, but something wonderfully in between.

What Exactly Is Bactrospora Lichen?

Before we dive in, let’s clear up what we’re dealing with here. Bactrospora patellarioides isn’t actually a plant you can grow in your garden – it’s a lichen! Lichens are incredible partnerships between fungi and algae (or cyanobacteria) that work together to create something entirely unique. Think of them as nature’s ultimate roommates, each bringing something valuable to the relationship.

This particular lichen also goes by the scientific synonyms Bacidia clementis and Lecanactis patellarioides, but don’t worry – you won’t need to remember those for your next dinner party conversation.

Where You’ll Find This Native Beauty

Bactrospora patellarioides is native to North America, making it a true local resident in many areas across the continent. You’ll typically spot these lichens growing on tree bark, where they form small, circular to irregular patches that blend seamlessly with their surroundings.

Identifying Bactrospora Lichen

So how do you know if you’ve found bactrospora lichen? Here are the key features to look for:

  • Small, crusty patches on tree bark
  • Grayish-white to pale coloration
  • Circular to irregular growth patterns
  • Flat, closely attached to the bark surface
  • Typically found on the bark of various tree species

Is It Beneficial to Your Garden?

Absolutely! While you can’t plant or cultivate bactrospora lichen, having it show up naturally in your garden is actually a wonderful sign. Here’s why you should be happy to see it:

Lichens are incredibly sensitive to air pollution and environmental changes. When you spot bactrospora lichen thriving on your trees, it’s like getting a green thumbs-up from nature herself – your garden has clean, healthy air! They act as natural air quality monitors, disappearing when pollution levels rise and flourishing when conditions are good.

Plus, lichens contribute to the overall biodiversity of your garden ecosystem. They provide tiny habitats for microscopic creatures and add to the complex web of life that makes healthy gardens so resilient.

The Care and Growing Reality

Here’s where things get interesting – you can’t actually plant, grow, or care for bactrospora lichen in the traditional sense. These remarkable organisms establish themselves naturally when conditions are right. They don’t need watering, fertilizing, or pruning. In fact, the best thing you can do for lichens is simply leave them alone!

If you want to encourage lichens in your garden, focus on:

  • Maintaining good air quality around your property
  • Avoiding the use of harsh chemicals or fungicides near trees
  • Preserving mature trees that provide suitable bark surfaces
  • Creating a generally healthy, low-pollution garden environment

The Bottom Line

Bactrospora lichen isn’t something you’ll find at your local nursery, and you won’t be adding it to your spring planting list. Instead, think of it as a delightful surprise guest that might show up to tell you that your garden is doing something right. When you spot these unassuming little patches on your trees, take a moment to appreciate the complex, beautiful partnerships happening right in your own backyard.

Remember, the presence of lichens like Bactrospora patellarioides is a sign of a healthy, balanced garden ecosystem – and that’s something worth celebrating!

Bactrospora Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Opegraphales

Family

Opegraphaceae Stizenb.

Genus

Bactrospora A. Massal. - bactrospora lichen

Species

Bactrospora patellarioides (Nyl.) Vain. - bactrospora lichen

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