North America Native Plant

Radula Obtusiloba Polyclada

Botanical name: Radula obtusiloba polyclada

USDA symbol: RAOBP

Habit: nonvascular

Native status: Native to North America  

Radula obtusiloba polyclada: A Tiny But Mighty Garden Ally Ever noticed those small, leafy green patches hugging the bark of trees or carpeting moist rocks in your garden? You might be looking at a liverwort – and possibly even the fascinating Radula obtusiloba polyclada. While this little plant doesn’t have ...

Rare plant alert!

Region: Conservation status by state

Status: S3S5T2T4: Status is uncertain but is somewhere between the following rankings: Subspecies or variety is 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 ⚘ Subspecies or varieties is apparently secure: Uncommon but not rare, and usually widespread. Possibly cause for longterm concern. Typically more than 100 occurrences in the region or more than 10,000 individuals ⚘ Secure: At very low or no risk of extinction in the jurisdiction due to a very extensive range, abundant populations or occurrences, with little to no concern from declines or threats. ⚘

Radula obtusiloba polyclada: A Tiny But Mighty Garden Ally

Ever noticed those small, leafy green patches hugging the bark of trees or carpeting moist rocks in your garden? You might be looking at a liverwort – and possibly even the fascinating Radula obtusiloba polyclada. While this little plant doesn’t have a catchy common name, it’s definitely worth getting to know!

What Exactly Is This Mysterious Plant?

Radula obtusiloba polyclada belongs to an ancient group of plants called liverworts. Think of them as the quiet cousins of mosses – they’ve been around for millions of years, long before flowering plants decided to show up to the party. These aren’t your typical garden plants, but rather fascinating little organisms that prefer to live life on the edge – literally clinging to rocks, tree bark, and other solid surfaces rather than growing in soil like most plants we’re familiar with.

This particular liverwort is completely herbaceous, meaning it stays soft and green year-round (where conditions allow). You’ll typically spot it attached to rocks, living trees, or even dead wood, where it forms small, intricate patterns that look almost like tiny green scales or leaves.

Where Does It Call Home?

This liverwort is a proud North American native, though the exact details of where you might find it across the continent remain somewhat mysterious. Like many of its liverwort relatives, it likely prefers areas with consistent moisture and protection from harsh direct sunlight.

Is It Good for Your Garden?

Here’s where things get interesting! While you probably won’t be planting Radula obtusiloba polyclada intentionally, discovering it in your garden is actually a pretty good sign. Here’s why having liverworts around is beneficial:

  • They’re excellent indicators of good air quality and environmental health
  • They help retain moisture in their immediate environment
  • They create tiny microhabitats for beneficial insects and other small creatures
  • They add subtle texture and visual interest to natural garden areas
  • They’re part of the complex web of life that supports a healthy ecosystem

A Word of Caution: Rarity Matters

Before you get too excited about encouraging liverworts in your garden, there’s something important to know about this particular species. Radula obtusiloba polyclada has a conservation status that suggests it may be uncommon or facing some challenges in the wild. This means if you’re lucky enough to spot it, treat it with extra care and respect.

Rather than trying to cultivate or move it, the best thing you can do is:

  • Leave it undisturbed where you find it
  • Maintain the conditions that allow it to thrive naturally
  • Avoid using pesticides or chemicals in areas where it grows
  • Keep foot traffic away from its habitat

How to Spot This Garden Guest

Identifying liverworts can be tricky since they’re quite small, but here are some tips for recognizing them in your outdoor space:

  • Look for small, flattened, leaf-like structures growing in overlapping patterns
  • Check moist, shaded areas on tree bark, rocks, or wooden structures
  • They often appear as green patches that look almost painted on surfaces
  • Unlike mosses, liverworts tend to have a more flattened, scale-like appearance
  • They prefer spots that stay consistently moist but not waterlogged

Creating Liverwort-Friendly Spaces

While you can’t exactly plant liverworts, you can certainly create conditions that welcome them and their relatives to your garden:

  • Maintain areas of consistent moisture without creating standing water
  • Preserve shaded spots with natural surfaces like bark or stone
  • Avoid disturbing existing patches of small, green growth on trees and rocks
  • Consider leaving some wild areas in your garden where nature can do its thing
  • Skip the chemicals – liverworts are sensitive to pollutants

The Bottom Line

Radula obtusiloba polyclada might not be the showstopper of your garden, but it represents something pretty special – a connection to ancient plant life and a healthy ecosystem. If you discover what you think might be this liverwort in your garden, consider yourself fortunate to be hosting such an interesting and potentially uncommon guest. The best way to grow it is simply to let it be and maintain the natural conditions that brought it to your space in the first place.

Remember, sometimes the smallest plants make the biggest difference in creating a truly diverse and thriving garden ecosystem!

Radula Obtusiloba Polyclada

Classification

Group

Liverwort

Kingdom

Plantae - Plants

Subkingdom
Superdivision
Division

Hepaticophyta - Liverworts

Subdivision

Hepaticae

Class

Hepaticopsida

Subclass

Jungermanniae

Order

Jungermanniales

Family

Radulaceae Müll. Frib.

Genus

Radula Dumort., nom. cons.

Species

Radula obtusiloba Steph.

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