North America Native Plant

Polyblastia Lichen

Botanical name: Polyblastia hyperborea

USDA symbol: POHY60

Habit: lichen

Native status: Native to North America  

Synonyms: Polyblastia integrascens (Nyl.) Vain. (POIN25)   

Polyblastia Lichen: A Tiny North American Native You Might Already Have Meet the polyblastia lichen (Polyblastia hyperborea), a fascinating little organism that’s probably living much closer to you than you think! This North American native isn’t your typical garden plant – in fact, it’s not a plant at all. It’s ...

Polyblastia Lichen: A Tiny North American Native You Might Already Have

Meet the polyblastia lichen (Polyblastia hyperborea), a fascinating little organism that’s probably living much closer to you than you think! This North American native isn’t your typical garden plant – in fact, it’s not a plant at all. It’s a lichen, which makes it one of nature’s most interesting partnerships.

What Exactly Is a Lichen?

Before we dive into the specifics of polyblastia lichen, let’s clear up what lichens actually are. Think of them as nature’s ultimate roommate situation – lichens are composite organisms made up of a fungus and an algae (or sometimes cyanobacteria) living together in perfect harmony. The fungus provides structure and protection, while the algae does the photosynthesis to make food. It’s a win-win relationship that’s been working for millions of years!

Where You’ll Find Polyblastia Lichen

Polyblastia hyperborea calls North America home, though specific distribution details for this particular species are limited in common gardening resources. Like many lichens, it likely prefers specific microhabitats where conditions are just right for its unique lifestyle.

Is This Lichen Beneficial for Your Garden?

While you can’t exactly plant polyblastia lichen like you would a tomato or a rose bush, having lichens in your garden ecosystem is actually a wonderful sign! Here’s why lichens like this one can be garden gold:

  • They’re excellent indicators of air quality – lichens are sensitive to pollution, so their presence suggests clean air
  • They contribute to the overall biodiversity of your outdoor space
  • They help with soil formation over very long periods by slowly breaking down rock surfaces
  • They’re part of the complex web of life that supports healthy ecosystems

How to Identify Polyblastia Lichen

Spotting polyblastia lichen requires a keen eye, as these organisms are typically quite small. Like other members of the Polyblastia genus, this lichen likely forms crusty growths on rock surfaces or other hard substrates. However, positive identification of this specific species would require microscopic examination and expertise in lichenology – the study of lichens.

If you’re curious about lichens in your area, consider:

  • Looking for crusty, scaly, or leaf-like growths on rocks, tree bark, or even concrete surfaces
  • Noting that lichens come in many colors – gray, green, yellow, orange, and even bright reds
  • Remembering that lichens grow very slowly, so established colonies represent years or even decades of growth

Creating a Lichen-Friendly Environment

While you can’t plant lichens directly, you can create conditions that welcome them to your garden naturally:

  • Maintain good air quality by avoiding excessive pesticide use
  • Leave some undisturbed rocky areas or old concrete surfaces
  • Be patient – lichens establish themselves slowly over time
  • Avoid cleaning or disturbing surfaces where lichens are growing

A Word of Caution About Collecting

If you do spot what might be polyblastia lichen or other lichens, resist the urge to collect them. Many lichen species grow extremely slowly, and removing them can damage populations that took years to establish. Instead, enjoy observing them in place and perhaps photograph them for your nature journal.

The Bottom Line

Polyblastia hyperborea might not be the showstopper you’re thinking of when planning your native plant garden, but it represents the incredible diversity of North American native organisms. These tiny partnerships between fungi and algae remind us that nature’s most interesting stories often happen on the smallest scales. So next time you’re out in your garden, take a moment to look closely at those rocky surfaces – you might just spot some of nature’s most successful collaborators!

Polyblastia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Verrucariales

Family

Verrucariaceae Eschw.

Genus

Polyblastia A. Massal. - polyblastia lichen

Species

Polyblastia hyperborea Th. Fr. - polyblastia lichen

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