North America Native Plant

Little’s Fissidens Moss

Botanical name: Fissidens littlei

USDA symbol: FILI2

Habit: nonvascular

Native status: Native to North America  

Synonyms: Fissidens orcuttii Grout (FIOR)   

Little’s Fissidens Moss: A Rare Treasure Worth Protecting Have you ever stumbled across a tiny, emerald carpet of moss and wondered what species you’re looking at? If you’re incredibly lucky, you might have encountered Little’s fissidens moss (Fissidens littlei), one of North America’s rarest and most critically imperiled bryophytes. This ...

Rare plant alert!

Region: Conservation status by state

Status: S1?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Critically Imperiled: Extremely rare due to factor(s) making it especially vulnerable to extinction. Typically 5 or fewer occurrences or very few remaining individuals (<1,000) ⚘

Little’s Fissidens Moss: A Rare Treasure Worth Protecting

Have you ever stumbled across a tiny, emerald carpet of moss and wondered what species you’re looking at? If you’re incredibly lucky, you might have encountered Little’s fissidens moss (Fissidens littlei), one of North America’s rarest and most critically imperiled bryophytes. This diminutive moss may be small in stature, but it plays an outsized role in our understanding of biodiversity and conservation.

What Exactly Is Little’s Fissidens Moss?

Little’s fissidens moss belongs to the fascinating world of bryophytes – those ancient, non-flowering plants that include mosses, liverworts, and hornworts. Unlike the towering trees and showy flowers that typically grab our attention, this modest moss quietly goes about its business as a terrestrial green plant, often clinging to rocks, fallen logs, or other solid surfaces rather than growing directly in soil.

What makes Fissidens littlei particularly distinctive is its growth habit. As a bryophyte, it’s always herbaceous and has a unique ability to attach itself to various surfaces, creating those enchanting green patches we sometimes spot in the wild. You might also see it referred to by its synonym, Fissidens orcuttii Grout, in older botanical references.

Where Does This Rare Moss Call Home?

Little’s fissidens moss is a true North American native, though its exact geographical distribution remains somewhat mysterious to researchers. What we do know is concerning: this species has earned a Global Conservation Status of S1?, meaning it’s critically imperiled. With typically five or fewer known occurrences and very few remaining individuals (fewer than 1,000), spotting this moss in the wild is like finding a botanical needle in a haystack.

Is Little’s Fissidens Moss Beneficial for Your Garden?

Here’s where things get interesting for gardeners and nature enthusiasts. While Little’s fissidens moss could theoretically add a unique, delicate texture to specialized garden settings like moss gardens, shade gardens, or woodland landscapes, its critically imperiled status means we need to approach it very differently than common garden plants.

In the right conditions – moist, shaded areas with good air circulation typically found in USDA hardiness zones 7-10 – this moss could create beautiful ground cover or add authenticity to naturalized woodland settings. However, the conservation implications far outweigh any aesthetic benefits.

The Conservation Challenge

If you’re thinking about incorporating Little’s fissidens moss into your landscape, pump the brakes for a moment. The S1? conservation status is a red flag that demands our respect and caution. This rating indicates that the species faces extreme rarity and vulnerability to extinction, making every individual plant precious beyond measure.

Should you ever encounter this moss in the wild, consider yourself privileged to witness something truly special. Rather than harvesting it for your garden, take photos, note the location, and perhaps report your sighting to local botanical organizations or conservation groups.

How to Identify Little’s Fissidens Moss

Identifying mosses can be tricky, but Fissidens species have some telltale characteristics:

  • Small, flattened appearance with leaves arranged in two distinct rows
  • Terrestrial growth habit, often on rocks or wood rather than soil
  • Vibrant green coloration when moist
  • Tiny size – you’ll likely need to get down on hands and knees for a good look

Keep in mind that definitive identification of Little’s fissidens moss typically requires microscopic examination by experts, so if you suspect you’ve found it, contact local botanists or mycological societies.

A Responsible Approach to Rare Plants

While we can’t recommend actively cultivating Little’s fissidens moss due to its conservation status, its existence reminds us of the incredible diversity hiding in plain sight. Instead of seeking out rare species for our gardens, we can:

  • Support conservation efforts for endangered plants
  • Choose common native moss species for landscaping projects
  • Create habitat conditions that might naturally support diverse bryophyte communities
  • Participate in citizen science projects that help track rare species

Little’s fissidens moss serves as a humbling reminder that some of nature’s most precious treasures are also its most vulnerable. By respecting its rarity and supporting broader conservation efforts, we can help ensure that future generations might also have the chance to marvel at this tiny but mighty survivor.

Little’s Fissidens Moss

Classification

Group

Moss

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Bryophyta - Mosses

Subdivision

Musci

Class

Bryopsida - True mosses

Subclass

Bryidae

Order

Fissidentales

Family

Fissidentaceae Schimp.

Genus

Fissidens Hedw. - fissidens moss

Species

Fissidens littlei (R.S. Williams) Grout - Little's fissidens moss

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