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North America Native Plant

Colorado Cracked Lichen

Colorado Cracked Lichen: A Rocky Mountain Natural Wonder Have you ever noticed those peculiar, puzzle-piece patterns covering rocks during your mountain hikes? You might have been looking at Colorado cracked lichen (Acarospora coloradiana), a fascinating organism that’s part of the natural tapestry of North America’s rocky landscapes. What Exactly Is ...

Colorado Cracked Lichen: A Rocky Mountain Natural Wonder

Have you ever noticed those peculiar, puzzle-piece patterns covering rocks during your mountain hikes? You might have been looking at Colorado cracked lichen (Acarospora coloradiana), a fascinating organism that’s part of the natural tapestry of North America’s rocky landscapes.

What Exactly Is Colorado Cracked Lichen?

Let’s clear up a common misconception first – lichens aren’t plants! They’re actually a remarkable partnership between fungi and algae, working together in perfect harmony. The Colorado cracked lichen is a crusty type that forms distinctive, cracked patches on rock surfaces, resembling a natural jigsaw puzzle.

This hardy little organism is native to North America, particularly thriving in the mountainous regions of Colorado and surrounding western states. It’s perfectly adapted to life on bare rock, where few other organisms can survive.

Spotting Colorado Cracked Lichen in the Wild

Identifying this lichen is like becoming a nature detective. Here’s what to look for:

  • Small, crusty patches that appear glued to rock surfaces
  • Distinctive cracked pattern resembling dried mud or puzzle pieces
  • Typically grayish to brownish coloration
  • Found on exposed rock faces, boulders, and stone outcrops
  • Most common at moderate to high elevations

Is It Beneficial for Your Garden?

While you can’t exactly plant Colorado cracked lichen in your garden like you would a flower, it can naturally appear on stone features, rock walls, or natural boulder formations. If you’re lucky enough to have it show up, consider it a sign of good air quality – lichens are sensitive to pollution and only thrive in clean environments.

Here are some ways this lichen benefits outdoor spaces:

  • Adds natural character and age to stone features
  • Indicates healthy, unpolluted air quality
  • Contributes to the ecosystem by slowly breaking down rock surfaces
  • Provides habitat for tiny insects and other small creatures

Creating Lichen-Friendly Conditions

You can’t force Colorado cracked lichen to grow, but you can create conditions where it might naturally establish:

  • Include natural stone features like rock walls or boulder groupings
  • Avoid using chemicals or fertilizers near stone surfaces
  • Ensure good air circulation around rocky areas
  • Be patient – lichens grow extremely slowly, sometimes taking years to establish

A Word of Caution

Never attempt to harvest or transplant lichens from wild areas. They’re incredibly slow-growing and removing them can damage both the organism and its habitat. Instead, appreciate them where they naturally occur and create welcoming conditions in your own landscape.

The Bottom Line

Colorado cracked lichen may not be the showiest addition to your outdoor space, but it’s a fascinating example of nature’s resilience and cooperation. If you spot these cracked, puzzle-like patches on rocks in your area, take a moment to appreciate this unique partnership between fungi and algae that’s been quietly decorating our landscapes for thousands of years.

Colorado Cracked Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Acarosporaceae Zahlbr.

Genus

Acarospora A. Massal. - cracked lichen

Species

Acarospora coloradiana H. Magn. - Colorado cracked lichen

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