North America Native Plant

Atlantic Cup Lichen

Botanical name: Cladonia atlantica

USDA symbol: CLAT2

Habit: lichen

Native status: Native to North America  

Atlantic Cup Lichen: A Fascinating Natural Ground Cover You Can’t Plant (But Might Find!) If you’ve ever noticed tiny, cup-shaped structures dotting the ground in wooded areas or along trails, you might have encountered the Atlantic cup lichen (Cladonia atlantica). This fascinating organism isn’t actually a plant at all – ...

Atlantic Cup Lichen: A Fascinating Natural Ground Cover You Can’t Plant (But Might Find!)

If you’ve ever noticed tiny, cup-shaped structures dotting the ground in wooded areas or along trails, you might have encountered the Atlantic cup lichen (Cladonia atlantica). This fascinating organism isn’t actually a plant at all – it’s a lichen, which makes it a pretty unique addition to any natural landscape discussion!

What Exactly Is Atlantic Cup Lichen?

Atlantic cup lichen belongs to a remarkable group of organisms that are part fungus, part algae, living together in perfect harmony. Think of it as nature’s original roommate situation – the fungus provides structure and protection, while the algae produces food through photosynthesis. The result? These charming little cup-shaped structures that look like tiny goblets scattered across the forest floor.

This particular species is native to North America, with its range primarily focused along the eastern regions, especially in Atlantic coastal areas. You’re most likely to spot it in areas with acidic soils and good drainage.

How to Identify Atlantic Cup Lichen

Spotting Cladonia atlantica is like going on a miniature treasure hunt. Here’s what to look for:

  • Small, cup-shaped structures (called podetia) that stand upright from the ground
  • Grayish-green to whitish coloration
  • Typically found growing on acidic, sandy, or peaty soils
  • Often appears in partially shaded to open areas
  • Forms small colonies or scattered individual cups

Is It Beneficial to Have in Your Garden?

Here’s where things get interesting – you can’t actually plant Atlantic cup lichen in your garden, even if you wanted to! Lichens are incredibly sensitive to their environment and simply won’t survive transplanting or cultivation attempts. They’re like that friend who only thrives in very specific conditions.

However, if you’re lucky enough to have this lichen naturally occurring on your property, consider it a good sign! Lichens are excellent indicators of clean air and healthy ecosystems. Their presence suggests your local environment is relatively unpolluted.

The Role of Atlantic Cup Lichen in Natural Landscapes

While you won’t be adding this to your garden border anytime soon, Atlantic cup lichen plays several important ecological roles:

  • Helps prevent soil erosion with its ground-covering growth pattern
  • Provides habitat and food for small insects and other tiny creatures
  • Contributes to soil formation over time as it breaks down
  • Serves as an indicator species for environmental health

What This Means for Your Garden

If you discover Atlantic cup lichen on your property, the best thing you can do is simply leave it alone and appreciate it for what it is – a sign of a healthy, balanced ecosystem. Avoid using chemical treatments in areas where it grows, as lichens are extremely sensitive to pollution and chemicals.

Instead of trying to cultivate lichens, consider creating conditions that support the natural ecosystem they represent. This might include:

  • Maintaining areas of acidic, well-draining soil
  • Avoiding excessive fertilization in natural areas
  • Reducing chemical use in your landscape
  • Preserving partially shaded natural areas

While you can’t add Atlantic cup lichen to your shopping list at the local nursery, discovering it in your natural landscape is like finding a hidden gem – a reminder that some of nature’s most fascinating organisms can’t be bought, only appreciated where they choose to make their home.

Atlantic Cup Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Cladoniaceae Zenker

Genus

Cladonia P. Browne - cup lichen

Species

Cladonia atlantica A. Evans - Atlantic cup lichen

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