Peltate Rimmed Navel Lichen: A Fascinating Rock Dweller in Your Garden
Have you ever noticed those crusty, circular patches growing on rocks in your garden and wondered what they were? Meet the peltate rimmed navel lichen (Rhizoplaca peltata), a remarkable organism that’s probably been quietly decorating your stone surfaces for years without you even realizing it!
What Exactly Is a Lichen?
Before we dive into this particular species, let’s clear up what a lichen actually is. Lichens aren’t plants at all – they’re fascinating partnerships between fungi and algae (or cyanobacteria). Think of them as nature’s ultimate roommates, working together to create something neither could accomplish alone. The fungus provides structure and protection, while the algae photosynthesizes to create food for both partners.
Meet the Peltate Rimmed Navel Lichen
The peltate rimmed navel lichen is native to North America and belongs to a group of rock-loving lichens. You might also see it listed under its former scientific name, Lecanora peltata, in older field guides. This hardy little organism has made its home across various rocky landscapes throughout the continent.
Unfortunately, specific details about its exact geographic distribution aren’t well-documented in readily available sources, but these types of lichens are commonly found in mountainous and rocky regions where they can attach to suitable stone surfaces.
Identifying Peltate Rimmed Navel Lichen
Spotting this lichen is all about knowing what to look for:
- Forms circular, crusty patches on rock surfaces
- Grayish-green to pale green coloration
- Features distinctive raised rims around the edges (hence rimmed in the name)
- Creates a navel-like depression in the center of mature specimens
- Typically grows on limestone and other calcareous rocks
- Appears as flat, spreading patches that seem glued to the rock surface
Is It Beneficial in Your Garden?
While you can’t exactly plant or cultivate peltate rimmed navel lichen (it grows where it wants to grow!), having it appear naturally in your garden is actually a good sign. Here’s why lichens like this one are garden allies:
- Air quality indicators: Lichens are sensitive to air pollution, so their presence suggests you have relatively clean air
- Ecosystem contributors: They provide food and shelter for tiny insects and other microorganisms
- Soil builders: Over time, lichens help break down rock surfaces, contributing to soil formation
- Natural beauty: They add subtle texture and color variation to stone features
- Low maintenance: They require absolutely no care from you!
Living with Lichens in Your Landscape
If you discover peltate rimmed navel lichen on rocks in your garden, consider yourself lucky! These slow-growing organisms can take years or even decades to establish themselves. Here are some ways to appreciate and coexist with them:
- Leave them undisturbed – they’re harmless to plants and structures
- Avoid power washing or scraping rocks where they’re growing
- Use them as natural teaching tools for children interested in nature
- Appreciate them as living indicators of your garden’s ecological health
The Bottom Line
While you can’t run out to the garden center and pick up a peltate rimmed navel lichen for your rock garden, you can learn to appreciate these remarkable organisms if they choose to make your garden their home. They’re completely harmless, require zero maintenance, and serve as fascinating examples of nature’s incredible ability to form cooperative relationships.
So the next time you’re wandering through your garden and spot those crusty patches on your stone walls or rock features, take a moment to appreciate these tiny marvels. They’re not just surviving – they’re thriving in partnership, creating their own little ecosystem right in your backyard!
