North America Native Plant

Jenner’s Cynodontium Moss

Botanical name: Cynodontium jenneri

USDA symbol: CYJE

Habit: nonvascular

Native status: Native to North America  

Synonyms: Cynodontium polycarpon (Hedw.) Schimp. var. laxirete (Dix.) Dix. (CYPOL2)  ⚘  Oncophorus jenneri (Schimp.) R.S. Williams (ONJE)   

Discovering Jenner’s Cynodontium Moss: A Tiny Native Wonder Ever wondered about those tiny green carpets you spot growing on rocks and fallen logs during your woodland walks? You might just be looking at Jenner’s cynodontium moss (Cynodontium jenneri), a fascinating native moss species that quietly plays an important role in ...

Discovering Jenner’s Cynodontium Moss: A Tiny Native Wonder

Ever wondered about those tiny green carpets you spot growing on rocks and fallen logs during your woodland walks? You might just be looking at Jenner’s cynodontium moss (Cynodontium jenneri), a fascinating native moss species that quietly plays an important role in North American ecosystems.

What Exactly Is Jenner’s Cynodontium Moss?

Jenner’s cynodontium moss is a small, terrestrial moss native to North America. Like other mosses, it’s a non-flowering plant that reproduces through spores rather than seeds. This particular species belongs to a group of mosses known for their ability to thrive in various outdoor conditions, often making their homes on rocks, fallen logs, and sometimes directly on soil.

You might also encounter this moss listed under its synonyms in older botanical references: Cynodontium polycarpon var. laxirete or Oncophorus jenneri. But don’t let the scientific names intimidate you – this is simply a small, green moss doing what mosses do best: quietly existing and supporting the ecosystem around it.

Where Can You Find This Native Moss?

As a North American native, Jenner’s cynodontium moss has naturally established itself across various regions of the continent. However, specific distribution details for this particular species can be quite localized, and you’re most likely to encounter it in woodland settings where moisture and shade create ideal growing conditions.

Is This Moss Beneficial for Your Garden?

While you might not deliberately plant Jenner’s cynodontium moss (mosses aren’t typically sold at garden centers), having it appear naturally in your landscape can actually be quite beneficial:

  • Helps prevent soil erosion on slopes and around tree roots
  • Retains moisture in the soil, benefiting nearby plants
  • Provides habitat for tiny insects and other small creatures
  • Adds natural texture and year-round green color to shaded areas
  • Indicates healthy, unpolluted growing conditions

How to Identify Jenner’s Cynodontium Moss

Identifying specific moss species can be tricky even for experts, but here are some general characteristics to look for:

  • Forms small, dense cushions or patches
  • Grows primarily on rocks, logs, or sometimes soil
  • Thrives in shaded, moist environments
  • Stays green year-round in suitable conditions
  • Has tiny, narrow leaves that may appear hair-like

Keep in mind that definitive moss identification often requires microscopic examination, so if you’re curious about the exact species in your yard, consider reaching out to a local botanist or your county extension office.

Creating Moss-Friendly Conditions

Rather than trying to grow this moss deliberately, you can create conditions that welcome native mosses like Jenner’s cynodontium moss to establish naturally:

  • Maintain shaded areas in your landscape
  • Avoid using chemicals or fertilizers in woodland areas
  • Keep soil consistently moist but not waterlogged
  • Leave fallen logs and natural rock formations undisturbed
  • Reduce foot traffic in areas where moss is establishing

The Bottom Line on Jenner’s Cynodontium Moss

While Jenner’s cynodontium moss might not be the showstopper of your garden, it’s one of those quiet native species that contributes to a healthy, functioning ecosystem. If you’re lucky enough to have it growing naturally on your property, consider yourself fortunate to be hosting this small but important piece of North American biodiversity.

Remember, the best approach with native mosses is often simply to appreciate them where they naturally occur and create conditions that support their continued presence. After all, they’ve been perfecting their survival strategies for millions of years – sometimes the wisest thing we can do as gardeners is simply get out of their way.

Jenner’s Cynodontium 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

Cynodontium Bruch & Schimp. ex Schimp. - cynodontium moss

Species

Cynodontium jenneri (Schimp.) Stirt. - Jenner's cynodontium moss

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