North America Native Plant

Sphaerellothecium Abditum

Botanical name: Sphaerellothecium abditum

USDA symbol: SPAB

Habit: lichen

Native status: Native to North America  

Sphaerellothecium abditum: A Mysterious North American Lichen If you’ve ever wondered about the tiny, often overlooked organisms quietly living on tree bark and rocks in your garden, you might be curious about lichens like Sphaerellothecium abditum. This fascinating little organism represents one of nature’s most remarkable partnerships, and while you ...

Sphaerellothecium abditum: A Mysterious North American Lichen

If you’ve ever wondered about the tiny, often overlooked organisms quietly living on tree bark and rocks in your garden, you might be curious about lichens like Sphaerellothecium abditum. This fascinating little organism represents one of nature’s most remarkable partnerships, and while you probably won’t find it at your local garden center, it might already be calling your backyard home.

What Exactly Is Sphaerellothecium abditum?

Sphaerellothecium abditum is a lichen – but here’s where it gets interesting. Unlike the plants we typically think about when gardening, lichens aren’t actually plants at all. They’re composite organisms made up of a fungus and an alga (or sometimes a cyanobacterium) living together in what scientists call a symbiotic relationship. Think of it as nature’s ultimate roommate situation, where both parties benefit from the arrangement.

This particular lichen belongs to a group that often lives as a parasite or partner on other lichens, making it what researchers call a lichenicolous species. It’s like the lichen world’s version of a tiny apartment dweller who’s found the perfect spot to set up shop.

Where You Might Find This Little Wonder

Sphaerellothecium abditum is native to North America, though specific details about its exact range and distribution patterns remain somewhat mysterious to researchers. Like many specialized lichen species, it likely has particular habitat preferences that make it more common in some regions than others.

Is It Beneficial to Your Garden?

While Sphaerellothecium abditum won’t add colorful blooms to your flower beds, lichens like this one can actually be quite beneficial to garden ecosystems in subtle ways:

  • They contribute to biodiversity by creating micro-habitats for tiny insects and other small creatures
  • Some lichens can indicate good air quality in your area
  • They add to the natural character and aged appearance of trees and garden structures
  • They’re part of the complex web of organisms that make healthy ecosystems function

How to Identify Sphaerellothecium abditum

Identifying this particular lichen species can be quite challenging, even for experienced naturalists. Here’s what to look for:

  • Look for it growing on or near other lichen species rather than directly on bark or rock
  • It typically appears as very small, dark structures that might be easily overlooked
  • You’ll likely need a hand lens or magnifying glass to get a good look at its features
  • Professional identification often requires microscopic examination

If you think you’ve spotted this lichen, consider taking photos and reaching out to local naturalist groups or university extension offices for help with identification.

Living With Lichens in Your Garden

The best approach to lichens like Sphaerellothecium abditum is simply to appreciate them as part of your garden’s natural ecosystem. You can’t really grow them in the traditional sense, but you can create conditions that make them more likely to thrive:

  • Avoid using harsh chemicals or fungicides that might harm these sensitive organisms
  • Let some areas of your garden develop a more natural, less manicured appearance
  • Keep mature trees and shrubs that provide stable surfaces for lichen growth
  • Be patient – lichens grow very slowly and establish over many years

The Bottom Line

Sphaerellothecium abditum might not be the showstopper that draws visitors to admire your garden, but it represents something pretty special: the incredible diversity of life that can exist in even the most ordinary outdoor spaces. While you won’t be planting it anytime soon, taking a moment to appreciate these tiny marvels can add a whole new dimension to how you experience your garden’s ecosystem.

Next time you’re wandering through your yard, take a closer look at the surfaces around you. You might just discover that your garden is home to more fascinating life forms than you ever imagined.

Sphaerellothecium Abditum

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Dothideales

Family

Mycosphaerellaceae Lindau

Genus

Sphaerellothecium Zopf - sphaerellothecium lichen

Species

Sphaerellothecium abditum Triebel

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