North America Native Plant

Rinodina Lichen

Botanical name: Rinodina lecanorina

USDA symbol: RILE6

Habit: lichen

Native status: Native to North America  

Synonyms: Rinodina ocellata (Hoffm.) Arnold (RIOC4)   

Rinodina Lichen: A Tiny Garden Guest You’ll Want to Welcome Have you ever noticed those small, crusty patches on your tree bark that look like someone splattered gray paint in perfect circles? Meet the rinodina lichen (Rinodina lecanorina), a fascinating organism that’s probably already living in your garden without you ...

Rinodina Lichen: A Tiny Garden Guest You’ll Want to Welcome

Have you ever noticed those small, crusty patches on your tree bark that look like someone splattered gray paint in perfect circles? Meet the rinodina lichen (Rinodina lecanorina), a fascinating organism that’s probably already living in your garden without you even knowing it!

What Exactly Is Rinodina Lichen?

Here’s where things get interesting: rinodina lichen isn’t actually a plant at all! It’s a unique partnership between a fungus and an algae (and sometimes bacteria too) that decided to team up and live together. Think of it as nature’s original roommate situation – the fungus provides shelter and nutrients, while the algae makes food through photosynthesis. It’s a win-win arrangement that’s been working out pretty well for millions of years.

Rinodina lecanorina goes by the scientific synonym Rinodina ocellata, but don’t worry about memorizing that – rinodina lichen works just fine for most of us garden enthusiasts.

Where You’ll Find This Little Wonder

This native North American species has made itself at home across the continent, particularly thriving in temperate regions where the air is clean and the trees are welcoming. You’ll most commonly spot it growing on the bark of mature trees, where it forms those distinctive circular or irregular patches.

Is Rinodina Lichen Good for Your Garden?

Absolutely! While you might not have invited it, rinodina lichen is actually a wonderful garden guest. Here’s why you should be happy to see it:

  • Air quality indicator: Lichens are like nature’s canaries in coal mines – they’re sensitive to air pollution, so their presence means your garden has relatively clean air
  • Ecosystem support: These tiny organisms provide food and shelter for small invertebrates, which in turn feed birds and other wildlife
  • Natural character: They add an authentic, weathered look to trees that speaks of a mature, established garden
  • Zero maintenance: They ask for nothing and give back plenty

How to Identify Rinodina Lichen

Spotting rinodina lichen is easier than you might think once you know what to look for:

  • Appearance: Small, circular to irregular patches that look crusty or scaly
  • Color: Typically grayish to brownish, sometimes with a slightly greenish tint
  • Texture: Flat and closely attached to bark surface
  • Size: Individual patches are usually small, often less than an inch across
  • Location: Found on tree bark, particularly on the north side or in partially shaded areas

Creating a Lichen-Friendly Environment

While you can’t exactly plant rinodina lichen (remember, it’s not a plant!), you can create conditions that welcome it to your garden naturally:

  • Maintain clean air: Avoid using harsh chemicals or pesticides near trees
  • Keep mature trees: Older trees with established bark provide the best real estate for lichens
  • Provide partial shade: Lichens prefer areas that aren’t in blazing sun all day
  • Be patient: Lichens grow incredibly slowly – we’re talking millimeters per year

A Few Friendly Reminders

If you’re lucky enough to have rinodina lichen in your garden, resist the urge to help it along. Don’t try to transplant it, scrape it off to clean your trees, or treat it with fertilizers. These little partnerships have been perfecting their lifestyle long before gardens existed, and they know what they’re doing.

Think of rinodina lichen as a badge of honor for your garden – it’s nature’s way of saying you’re doing something right. So the next time you spot those tiny gray patches on your trees, give them a little nod of appreciation. They’re small, they’re quiet, and they’re working hard to make your garden a healthier, more complete ecosystem.

Rinodina Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Physciaceae Zahlbr.

Genus

Rinodina (Ach.) A. Gray - rinodina lichen

Species

Rinodina lecanorina (A. Massal.) A. Massal. - rinodina lichen

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