North America Native Plant

Flotow’s Dimple Lichen

Botanical name: Gyalecta flotowii

USDA symbol: GYFL2

Habit: lichen

Native status: Native to North America  

Flotow’s Dimple Lichen: A Fascinating Native Find in Your Landscape Have you ever noticed small, crusty patches on tree bark or rocks that look almost like someone pressed tiny dimples into a grayish surface? You might be looking at Flotow’s dimple lichen (Gyalecta flotowii), one of North America’s more intriguing ...

Flotow’s Dimple Lichen: A Fascinating Native Find in Your Landscape

Have you ever noticed small, crusty patches on tree bark or rocks that look almost like someone pressed tiny dimples into a grayish surface? You might be looking at Flotow’s dimple lichen (Gyalecta flotowii), one of North America’s more intriguing native species that’s been quietly decorating our natural landscapes for centuries.

What Exactly Is Flotow’s Dimple Lichen?

Before we dive deeper, let’s clear up what we’re dealing with here. Flotow’s dimple lichen isn’t your typical garden plant – it’s actually a fascinating partnership between fungi and algae working together as one organism. This collaborative relationship creates those distinctive crusty patches you might spot during nature walks.

As a native species to North America, particularly thriving in eastern regions and cooler climates, this lichen has been part of our ecosystems long before any of us started thinking about native gardening. It’s perfectly adapted to our local conditions and plays its own small but important role in the natural world.

Spotting Flotow’s Dimple Lichen in the Wild

The key to identifying this lichen lies in its name – those characteristic dimples or depressions that dot its surface. Here’s what to look for:

  • Small, whitish to grayish crusty patches on tree bark or rock surfaces
  • Distinctive dimpled or pitted appearance across the surface
  • Typically found in areas with clean air and adequate moisture
  • More common in cooler, northern climates

Is It Beneficial to Have in Your Garden?

While you can’t exactly plant Flotow’s dimple lichen like you would a wildflower, its presence in your landscape is actually a wonderful sign. Lichens are excellent indicators of air quality – they’re quite sensitive to pollution, so finding them suggests you’ve got clean, healthy air around your property.

Here are some benefits of having lichens like Flotow’s dimple lichen around:

  • They indicate good environmental health and clean air quality
  • They add subtle texture and interest to tree bark and rock surfaces
  • They’re part of the natural ecosystem, providing habitat for tiny organisms
  • They help with nutrient cycling in forest environments

Creating Lichen-Friendly Conditions

While you can’t cultivate Flotow’s dimple lichen directly, you can create conditions that might encourage lichens to establish naturally in your landscape:

  • Maintain clean air quality around your property
  • Preserve existing mature trees with textured bark
  • Keep humidity levels adequate through natural landscaping
  • Avoid using harsh chemicals or pesticides that might harm sensitive organisms
  • Leave natural rock surfaces undisturbed

The Bottom Line

Flotow’s dimple lichen represents one of those quiet victories of native species conservation. You won’t be adding it to your shopping list at the garden center, but if you’re lucky enough to spot it on your property, consider it a badge of honor for maintaining a healthy, natural environment.

Keep your eyes open during your next nature walk – once you know what to look for, you might be surprised by how much life is quietly thriving right under your nose, including these fascinating partnerships between fungi and algae that we call lichens.

Flotow’s Dimple Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Gyalectales

Family

Gyalectaceae Stizenb.

Genus

Gyalecta Ach. - dimple lichen

Species

Gyalecta flotowii Körb. - Flotow's dimple lichen

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