North America Native Plant

Cecidonia Lichen

Botanical name: Cecidonia umbonella

USDA symbol: CEUM3

Habit: lichen

Native status: Native to North America  

Cecidonia Lichen: A Mysterious Garden Visitor If you’ve stumbled across the name cecidonia lichen in your gardening research, you might be wondering what exactly this curious organism is and whether it belongs in your landscape. Let’s dive into the fascinating world of this North American native and explore what makes ...

Cecidonia Lichen: A Mysterious Garden Visitor

If you’ve stumbled across the name cecidonia lichen in your gardening research, you might be wondering what exactly this curious organism is and whether it belongs in your landscape. Let’s dive into the fascinating world of this North American native and explore what makes lichens such unique garden companions.

What Exactly Is Cecidonia Lichen?

Cecidonia umbonella, commonly known as cecidonia lichen, is a type of lichen native to North America. Now, here’s where things get interesting – lichens aren’t actually plants at all! They’re remarkable partnerships between fungi and algae (or sometimes cyanobacteria) living together in perfect harmony. Think of them as nature’s original roommates, where everyone benefits from the arrangement.

Unlike the flowers and shrubs you’re used to planting, lichens don’t have roots, stems, or leaves. Instead, they form crusty, leafy, or branching structures that can attach to rocks, tree bark, soil, or even man-made surfaces.

Where You’ll Find This Native Beauty

As a North American native, cecidonia lichen has been quietly going about its business on our continent long before any of us started thinking about landscape design. However, specific details about its exact geographic range remain somewhat mysterious – lichens can be surprisingly elusive when it comes to detailed distribution records.

Is Cecidonia Lichen Good for Your Garden?

Here’s the thing about lichens – you don’t really plant them in the traditional sense, but they can absolutely be beneficial garden residents! Here’s why you might want to welcome them:

  • Air quality indicators: Lichens are incredibly sensitive to air pollution, so their presence often indicates clean, healthy air
  • Natural beauty: They add subtle texture and color to surfaces, creating an aged, natural look
  • Wildlife habitat: Some birds use lichens for nesting material, and tiny insects may call them home
  • Soil building: Over time, they can help break down rock surfaces and contribute to soil formation

How to Identify Cecidonia Lichen

Identifying specific lichen species can be tricky business – even experienced botanists sometimes need a magnifying glass and a good field guide! Since detailed identification characteristics for cecidonia lichen are limited, here are some general tips for lichen spotting:

  • Look for organisms growing directly on surfaces (not rooted in soil)
  • Notice their often circular or irregular growth patterns
  • Observe their various colors – lichens can be gray, green, yellow, orange, or even bright red
  • Check their texture – some are crusty and flat, others are leafy, and some are branched like tiny shrubs

Creating a Lichen-Friendly Environment

While you can’t exactly plant cecidonia lichen, you can certainly create conditions where lichens are more likely to show up and thrive:

  • Minimize chemical use: Avoid pesticides and fertilizers in areas where you’d like to see lichens
  • Provide surfaces: Leave some rocks, old wood, or even concrete surfaces undisturbed
  • Ensure good air circulation: Lichens prefer areas with clean, moving air
  • Be patient: Lichens grow incredibly slowly – we’re talking millimeters per year!

The Bottom Line

Cecidonia lichen represents one of nature’s most fascinating partnerships, and as a North American native, it’s perfectly at home in our landscapes. While you can’t purchase it at your local nursery or plant it like a traditional perennial, you can create welcoming conditions and appreciate these remarkable organisms when they decide to grace your garden with their presence.

Remember, lichens are signs of a healthy ecosystem, so if you spot them growing naturally in your landscape, consider yourself lucky to be witnessing one of nature’s most enduring success stories!

Cecidonia Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Lecideaceae Chevall.

Genus

Cecidonia Treibel & Rambold - cecidonia lichen

Species

Cecidonia umbonella (Nyl.) Triebel & Rambold - cecidonia lichen

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