North America Native Plant

Kozlov’s Pterygoneurum Moss

Botanical name: Pterygoneurum kozlovii

USDA symbol: PTKO

Habit: nonvascular

Native status: Native to North America  

Synonyms: Pterygoneurum smardaeanum Vanek (PTSM)   

Kozlov’s Pterygoneurum Moss: A Rare North American Bryophyte Meet Kozlov’s pterygoneurum moss, a fascinating little bryophyte that’s quietly going about its business in North American landscapes. While you might not find this moss at your local garden center, understanding what it is and recognizing it in the wild can deepen ...

Rare plant alert!

Region: Conservation status by state

Status: S2S3: Status is uncertain but is somewhere between the following rankings: Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) ⚘ Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Kozlov’s Pterygoneurum Moss: A Rare North American Bryophyte

Meet Kozlov’s pterygoneurum moss, a fascinating little bryophyte that’s quietly going about its business in North American landscapes. While you might not find this moss at your local garden center, understanding what it is and recognizing it in the wild can deepen your appreciation for the incredible diversity of native plants right under our noses—or should we say, under our feet!

What Exactly Is Kozlov’s Pterygoneurum Moss?

Pterygoneurum kozlovii (sometimes known by its synonym Pterygoneurum smardaeanum) is a terrestrial moss native to North America. Like all mosses, it’s a bryophyte—one of those amazing green plants that includes mosses, liverworts, and hornworts. These little green gems are often overlooked, but they’re botanical marvels that have been around far longer than flowering plants!

This particular moss is what botanists call terrestrial, meaning it grows on solid surfaces like rocks, dead wood, or sometimes living trees, rather than directly in soil. Think of it as nature’s way of adding a green carpet to otherwise bare surfaces.

Where Does This Moss Call Home?

Kozlov’s pterygoneurum moss is native to North America, though the specific regions where it naturally occurs aren’t well documented in readily available sources. Like many moss species, it likely has specific habitat preferences that determine where you might stumble across it during your outdoor adventures.

Is This Moss Rare?

Here’s where things get interesting—and a bit concerning. Pterygoneurum kozlovii has a Global Conservation Status of S2S3, which indicates it may be quite uncommon. While the exact implications of this status aren’t fully defined, it suggests this moss deserves our attention and respect when encountered in the wild.

If you’re lucky enough to spot this moss in nature, take photos and observations, but resist the urge to collect it. Rare mosses play important ecological roles, and removing them from their natural habitat could impact local ecosystems.

Benefits for Your Garden Ecosystem

While Kozlov’s pterygoneurum moss isn’t something you’d typically plant or cultivate, mosses in general are incredibly beneficial for garden ecosystems. They:

  • Help prevent soil erosion on slopes and bare patches
  • Retain moisture in the landscape
  • Provide habitat for tiny beneficial insects and microorganisms
  • Add texture and year-round green color to shaded areas
  • Require no fertilizers, pesticides, or regular watering once established

How to Identify This Moss

Identifying specific moss species can be tricky even for experienced botanists, as many mosses look quite similar to the untrained eye. Pterygoneurum kozlovii would need to be examined closely, often with magnification, to distinguish it from related species.

If you think you’ve encountered this or other interesting mosses in your area, consider:

  • Taking detailed photographs from multiple angles
  • Noting the habitat where you found it (type of surface, light conditions, moisture levels)
  • Recording the location and date
  • Consulting with local botanists or naturalist groups for identification help

Supporting Moss Diversity in Your Landscape

While you probably won’t be planting Kozlov’s pterygoneurum moss specifically, you can create conditions that support native moss communities in general:

  • Maintain some shaded, moist areas in your garden
  • Leave some bare rock or wood surfaces uncleared
  • Avoid using herbicides or fertilizers in areas where mosses naturally occur
  • Consider allowing native mosses to colonize paths, retaining walls, or other hardscaping features

The Bigger Picture

Kozlov’s pterygoneurum moss might be small and easily overlooked, but it represents something much larger: the incredible diversity of native plants that make up healthy North American ecosystems. Every species, no matter how tiny, plays a role in the complex web of life.

Next time you’re out in nature, take a moment to look down and appreciate the small green worlds beneath your feet. You might just be looking at something as special and rare as Pterygoneurum kozlovii!

Kozlov’s Pterygoneurum Moss

Classification

Group

Moss

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Bryophyta - Mosses

Subdivision

Musci

Class

Bryopsida - True mosses

Subclass

Bryidae

Order

Pottiales

Family

Pottiaceae Hampe

Genus

Pterygoneurum Jur. - pterygoneurum moss

Species

Pterygoneurum kozlovii Laz. - Kozlov's pterygoneurum moss

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