North America Native Plant

Sharp’s Homaliadelphus Moss

Botanical name: Homaliadelphus sharpii

USDA symbol: HOSH

Habit: nonvascular

Native status: Native to North America  

Synonyms: Homalia sharpii R.S. Williams (HOSH2)   

Sharp’s Homaliadelphus Moss: A Rare Native Bryophyte Worth Knowing Meet Sharp’s homaliadelphus moss (Homaliadelphus sharpii), one of North America’s more elusive native bryophytes. While you’re unlikely to encounter this little green gem in your local garden center, understanding rare native mosses like this one helps us appreciate the incredible diversity ...

Rare plant alert!

Region: Conservation status by state

Status: S3?: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ 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 ⚘

Sharp’s Homaliadelphus Moss: A Rare Native Bryophyte Worth Knowing

Meet Sharp’s homaliadelphus moss (Homaliadelphus sharpii), one of North America’s more elusive native bryophytes. While you’re unlikely to encounter this little green gem in your local garden center, understanding rare native mosses like this one helps us appreciate the incredible diversity hiding in plain sight throughout our natural landscapes.

What Exactly Is Sharp’s Homaliadelphus Moss?

Sharp’s homaliadelphus moss belongs to that fascinating world of bryophytes – those ancient, non-flowering plants that have been carpeting our planet for millions of years. Like all mosses, this species is herbaceous and has a knack for attaching itself to solid surfaces like rocks, tree bark, or fallen logs rather than growing directly in soil.

You might also see this moss referenced by its scientific synonym, Homalia sharpii, in older botanical literature. But regardless of what name you use, you’re talking about the same remarkable little plant.

Where Does This Moss Call Home?

This native North American species has a rather mysterious distribution pattern. Unlike some of our more common mosses that seem to pop up everywhere, Sharp’s homaliadelphus moss appears to be quite particular about where it chooses to grow, though the exact details of its range remain poorly documented by scientists.

A Rarity Worth Protecting

Here’s where things get interesting – and a bit concerning. Sharp’s homaliadelphus moss carries a Global Conservation Status of S3?, which essentially means we’re not entirely sure, but it might be rare. This uncertainty itself tells us something important: this moss is uncommon enough that scientists haven’t been able to fully assess its population status.

If you’re lucky enough to encounter what you think might be this species in the wild, resist the urge to collect it. Instead, take photos and consider reporting your sighting to local botanists or natural heritage programs.

Is This Moss Beneficial in Gardens?

While Sharp’s homaliadelphus moss isn’t something you’d intentionally cultivate in your backyard (even if you could find it for sale, which you can’t), understanding its role helps us appreciate the broader benefits that native mosses bring to our landscapes:

  • Soil stabilization and erosion control
  • Moisture retention in the ecosystem
  • Habitat for tiny invertebrates
  • Natural air purification
  • Adding to biodiversity in natural areas

How to Identify Sharp’s Homaliadelphus Moss

Identifying this particular moss species requires some serious botanical detective work and likely a good hand lens or microscope. Like many rare bryophytes, Sharp’s homaliadelphus moss doesn’t have obvious distinguishing features that jump out to the casual observer. Its small size and inconspicuous nature mean it could easily be overlooked among other moss species.

If you’re interested in moss identification, your best bet is to connect with local bryological societies or university botany departments. These expert moss enthusiasts can help you learn to distinguish between different species and might even know of documented locations where this rare species has been found.

Supporting Moss Conservation

While you can’t grow Sharp’s homaliadelphus moss in your garden, you can certainly support moss conservation in other ways. Consider creating moss-friendly spaces in your landscape by maintaining some shaded, moist areas where common native mosses can establish naturally. Avoid using moss killers and appreciate these ancient plants for the ecological services they provide.

Remember, every rare species like Sharp’s homaliadelphus moss represents millions of years of evolutionary history. By protecting their habitats and supporting conservation efforts, we help ensure these living treasures continue to thrive in our natural world – even if we can’t bring them home to our gardens.

Sharp’s Homaliadelphus Moss

Classification

Group

Moss

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Bryophyta - Mosses

Subdivision

Musci

Class

Bryopsida - True mosses

Subclass

Bryidae

Order

Leucodontales

Family

Neckeraceae Schimp.

Genus

Homaliadelphus Dix. & P. Varde - homaliadelphus moss

Species

Homaliadelphus sharpii (R.S. Williams) Sharp - Sharp's homaliadelphus moss

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