North America Native Plant

Oersted’s Campylopus Moss

Botanical name: Campylopus oerstedianus

USDA symbol: CAOE2

Habit: nonvascular

Native status: Native to North America  

Oersted’s Campylopus Moss: A Rare North American Native If you’ve ever wandered through a forest and noticed tiny, delicate green cushions growing on rocks or fallen logs, you might have encountered a member of the moss family. Today, let’s explore one particularly special species: Oersted’s campylopus moss (Campylopus oerstedianus), a ...

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 ⚘

Oersted’s Campylopus Moss: A Rare North American Native

If you’ve ever wandered through a forest and noticed tiny, delicate green cushions growing on rocks or fallen logs, you might have encountered a member of the moss family. Today, let’s explore one particularly special species: Oersted’s campylopus moss (Campylopus oerstedianus), a fascinating native moss that calls North America home.

What Is Oersted’s Campylopus Moss?

Oersted’s campylopus moss is a terrestrial moss that belongs to the diverse world of bryophytes – those ancient, non-flowering plants that have been quietly carpeting our planet for millions of years. Unlike the familiar grasses and flowers in your garden, this moss is entirely herbaceous and has a particular fondness for attaching itself to solid surfaces like rocks, tree bark, or decaying wood rather than growing directly in soil.

As a native North American species, this moss has been part of our continent’s natural heritage long before any of us started thinking about landscaping or garden design.

Why This Moss Matters

Here’s where things get interesting – and a bit concerning. Oersted’s campylopus moss has a Global Conservation Status of S2S3, which indicates it’s considered uncommon to rare. This makes it a species worth paying attention to and protecting when encountered in the wild.

If you’re lucky enough to spot this moss in nature, you’re looking at something that’s become increasingly scarce in our landscape. This rarity status means we should appreciate it from a distance and avoid disturbing any natural populations we might find.

Benefits to Your Garden Ecosystem

While we don’t have specific data on the wildlife benefits of this particular species, mosses in general are ecological workhorses. They:

  • Help prevent soil erosion
  • Retain moisture in the ecosystem
  • Provide shelter for tiny insects and microorganisms
  • Create habitat for small invertebrates
  • Contribute to the overall biodiversity of natural areas

Should You Try to Grow It?

Given its rare status, Oersted’s campylopus moss isn’t something you should actively seek out for your garden. Instead, if you’re interested in incorporating native mosses into your landscape, consider:

  • Allowing naturally occurring mosses to establish in appropriate spots
  • Creating conditions that favor moss growth (shade, consistent moisture, appropriate surfaces)
  • Working with local native plant societies to identify common moss species suitable for cultivation

Identifying This Special Moss

Unfortunately, identifying specific moss species requires expertise and often microscopic examination. If you suspect you’ve found Oersted’s campylopus moss in the wild, consider:

  • Taking photos (without disturbing the moss) and consulting with local botanists
  • Contacting your state’s natural heritage program
  • Reaching out to bryology (moss study) groups in your area

The Bottom Line

Oersted’s campylopus moss represents the quiet, often overlooked diversity that makes our native ecosystems so rich and complex. While it may not be a plant you’ll deliberately cultivate in your garden, knowing about its existence and rarity helps us appreciate the intricate web of life that surrounds us.

The next time you’re exploring natural areas in North America, take a moment to appreciate the small green worlds growing on rocks and logs around you. You might just be looking at something as special and rare as Oersted’s campylopus moss.

Oersted’s Campylopus Moss

Classification

Group

Moss

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Bryophyta - Mosses

Subdivision

Musci

Class

Bryopsida - True mosses

Subclass

Bryidae

Order

Dicranales

Family

Dicranaceae Schimp.

Genus

Campylopus Brid. - campylopus moss

Species

Campylopus oerstedianus (Müll. Hal.) Mitt. - Oersted's campylopus moss

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