North America Native Plant

Campylopus Moss

Botanical name: Campylopus angustiretis

USDA symbol: CAAN27

Habit: nonvascular

Native status: Native to North America  

Synonyms: Campylopus surinamensis Müll. Hal. var. angustiretis (Austin) J.-P. Frahm (CASUA2)   

Campylopus Moss: A Rare North American Bryophyte Worth Knowing If you’ve ever found yourself peering closely at the tiny green carpets that form on rocks, soil, and decaying wood, you might have encountered one of nature’s most underappreciated groups of plants: mosses. Today, we’re diving into the world of a ...

Rare plant alert!

Region: Conservation status by state

Status: S2?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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) ⚘

Campylopus Moss: A Rare North American Bryophyte Worth Knowing

If you’ve ever found yourself peering closely at the tiny green carpets that form on rocks, soil, and decaying wood, you might have encountered one of nature’s most underappreciated groups of plants: mosses. Today, we’re diving into the world of a particularly elusive species called campylopus moss (Campylopus angustiretis), a native North American bryophyte that’s as mysterious as it is fascinating.

What Exactly Is Campylopus Moss?

Campylopus moss belongs to the bryophyte family, which includes mosses, liverworts, and hornworts. These are some of the most ancient plants on Earth, and they’ve mastered the art of living simply. Unlike the flowering plants that dominate most gardens, bryophytes don’t have true roots, stems, or leaves in the traditional sense. Instead, they’re perfectly adapted to absorb water and nutrients directly through their surfaces.

This particular species is a terrestrial moss, meaning it grows on solid surfaces like rocks, soil, or dead wood rather than floating in water. You might also see it referred to by its synonym, Campylopus surinamensis var. angustiretis, in older botanical references.

Where Does It Call Home?

Campylopus moss is native to North America, though the exact details of its geographic distribution remain somewhat of a botanical mystery. This lack of detailed range information isn’t unusual for specialized moss species, as they often occupy very specific microhabitats that can be easily overlooked during surveys.

A Rare Find Indeed

Here’s where things get interesting (and a bit concerning): campylopus moss has a Global Conservation Status of S2?, which indicates it’s considered rare, though the question mark suggests there’s uncertainty about its exact status. This rarity makes it a particularly special find for any moss enthusiast or naturalist.

If you’re lucky enough to encounter this moss in the wild, it’s important to observe and photograph rather than collect. Rare species like this need all the help they can get to maintain stable populations.

Is It Beneficial to Have in Your Garden?

While you probably won’t be purchasing campylopus moss at your local nursery (it’s far too rare and specialized for commercial cultivation), mosses in general are incredibly beneficial to garden ecosystems. They:

  • Help prevent soil erosion by creating protective mats
  • Retain moisture in the landscape
  • Provide habitat for tiny invertebrates that form the base of many food webs
  • Add textural interest and a sense of age to gardens
  • Indicate good air quality, as many mosses are sensitive to pollution

If campylopus moss does happen to establish itself naturally in your garden, consider yourself incredibly fortunate and do everything you can to protect its habitat.

How to Identify This Elusive Species

Identifying specific moss species can be challenging even for experts, and campylopus moss is no exception. Like other members of the Campylopus genus, it likely forms small cushions or mats and attaches firmly to its growing surface. However, definitive identification typically requires microscopic examination of cellular structures and reproductive features.

If you suspect you’ve found this rare moss, consider reaching out to local botanical organizations or moss specialists who can help with proper identification. Your observation could contribute valuable information about this poorly understood species.

Creating Moss-Friendly Conditions

Rather than trying to cultivate this rare species, consider creating conditions that welcome native mosses in general:

  • Maintain areas with consistent moisture but good drainage
  • Provide surfaces like rocks, logs, or undisturbed soil
  • Minimize chemical inputs that could harm these sensitive plants
  • Create shaded or partially shaded areas
  • Be patient – mosses establish slowly but can be incredibly long-lived

The Big Picture

Campylopus moss represents one of the many small but important pieces of North America’s native biodiversity puzzle. While we may not know everything about where it grows or how to cultivate it, its very existence reminds us that there’s still so much to discover and protect in the natural world around us.

The next time you’re out exploring, take a moment to look closely at the moss communities growing in your area. You might not find campylopus moss specifically, but you’ll certainly discover a miniature world of incredible diversity and beauty that’s been quietly thriving right under our feet.

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 angustiretis (Austin) Lesq. & James - 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