North America Native Plant

Lethariicola Lichen

Botanical name: Lethariicola cucularis

USDA symbol: LECU7

Habit: lichen

Native status: Native to North America  

Synonyms: Lethariicola sepei Grummann (LESE11)   

Lethariicola Lichen: A Mysterious Native Species Worth Knowing Have you ever noticed tiny, crusty growths on tree bark or rocks in your garden and wondered what they were? You might have encountered a lichen! Today, we’re diving into the fascinating world of Lethariicola cucularis, commonly known as the lethariicola lichen—a ...

Lethariicola Lichen: A Mysterious Native Species Worth Knowing

Have you ever noticed tiny, crusty growths on tree bark or rocks in your garden and wondered what they were? You might have encountered a lichen! Today, we’re diving into the fascinating world of Lethariicola cucularis, commonly known as the lethariicola lichen—a native North American species that’s as intriguing as its name is hard to pronounce.

What Exactly Is Lethariicola Lichen?

Before we get too deep into the weeds (or should we say lichens?), let’s clear up what we’re dealing with. Lethariicola cucularis isn’t actually a plant at all! Lichens are fascinating composite organisms made up of a fungus and an algae (or cyanobacteria) living together in a mutually beneficial relationship. Think of them as nature’s original roommates—they’ve been successfully cohabitating for millions of years.

This particular lichen species is native to North America, though specific details about its exact range and distribution remain somewhat mysterious in the scientific literature. It’s also known by the scientific synonym Lethariicola sepei Grummann, in case you encounter that name in your botanical adventures.

Is This Lichen Beneficial for Your Garden?

While you can’t exactly plant lichens like you would a tomato or a rose bush, having them naturally occur in your garden is actually a wonderful sign! Lichens are excellent indicators of air quality—they’re basically nature’s air quality monitors. If lichens are thriving in your space, it typically means you have relatively clean air.

Here are some ways lichens can benefit your garden ecosystem:

  • They contribute to biodiversity in your landscape
  • They can provide nesting material for birds
  • Some lichens serve as food sources for wildlife
  • They help with soil formation as they slowly break down rock surfaces
  • They add unique textures and subtle colors to natural landscapes

How to Identify Lethariicola Lichen

Here’s where things get a bit tricky—detailed identification characteristics for Lethariicola cucularis are not readily available in standard field guides. This reflects the specialized nature of lichen identification, which often requires microscopic examination and chemical testing by experts.

If you suspect you’ve found this or other lichens in your garden, here are some general tips for lichen observation:

  • Look for crusty, leafy, or branching growths on bark, rocks, or soil
  • Note the color, texture, and growth pattern
  • Observe what surface they’re growing on
  • Take photos from multiple angles if you want expert identification

Creating a Lichen-Friendly Garden

While you can’t plant lichens directly, you can create conditions that encourage their natural establishment:

  • Avoid using chemical pesticides and fertilizers, which can harm these sensitive organisms
  • Maintain mature trees and natural rock features where lichens can establish
  • Keep some areas of your garden relatively undisturbed
  • Ensure good air circulation in your landscape

The Bottom Line

Lethariicola cucularis represents the incredible diversity of native organisms that can call your garden home, even if they’re not the showiest residents. While this particular lichen species remains somewhat mysterious in terms of detailed characteristics and distribution, its presence as a native North American species adds to the ecological richness of natural landscapes.

Remember, lichens grow slowly and are sensitive to environmental changes, so if you’re lucky enough to have them in your garden, consider yourself a steward of these ancient and fascinating organisms. Sometimes the smallest, quietest residents of our gardens have the most interesting stories to tell!

Lethariicola Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Ostropales

Family

Odontotremataceae D. Hawksw. & Sherwood

Genus

Lethariicola Grummann - lethariicola lichen

Species

Lethariicola cucularis (Norman) Lumbsch & D. Hawksw. - lethariicola lichen

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