North America Native Plant

Reticulate Mycocalicium Lichen

Botanical name: Mycocalicium reticulatum

USDA symbol: MYRE

Habit: lichen

Native status: Native to North America  

Reticulate Mycocalicium Lichen: A Fascinating Garden Visitor You Didn’t Plant Have you ever noticed tiny, crusty patches with intricate net-like patterns growing on tree bark or wooden surfaces in your garden? Meet the reticulate mycocalicium lichen (Mycocalicium reticulatum), a remarkable organism that might be quietly calling your garden home without ...

Reticulate Mycocalicium Lichen: A Fascinating Garden Visitor You Didn’t Plant

Have you ever noticed tiny, crusty patches with intricate net-like patterns growing on tree bark or wooden surfaces in your garden? Meet the reticulate mycocalicium lichen (Mycocalicium reticulatum), a remarkable organism that might be quietly calling your garden home without you even realizing it!

What Exactly Is This Mysterious Garden Guest?

Despite its plant-like name, Mycocalicium reticulatum isn’t actually a plant at all. It’s a lichen – a fascinating partnership between a fungus and an algae that work together to create something entirely unique. Think of it as nature’s ultimate collaboration project, where two very different organisms team up to thrive in places where neither could survive alone.

This native North American species gets its common name from its distinctive reticulated (net-like or mesh-like) surface pattern that looks almost like tiny natural artwork etched into tree bark or wooden surfaces.

Spotting Reticulate Mycocalicium in Your Garden

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

  • Small, crusty patches that appear firmly attached to bark or wood
  • Distinctive net-like or reticulated surface pattern
  • Typically grayish or pale coloration
  • Usually found on tree bark, old wooden fences, or weathered wood structures
  • Forms small, irregular patches rather than large, spreading colonies

Is This Lichen Beneficial for Your Garden?

Absolutely! While you can’t exactly plant reticulate mycocalicium lichen like you would a tomato, its presence in your garden is actually a wonderful sign. Here’s why you should welcome this tiny tenant:

  • Air quality indicator: Lichens are sensitive to air pollution, so their presence suggests your garden enjoys relatively clean air
  • Biodiversity booster: They add to the overall ecological richness of your outdoor space
  • Minimal impact: They don’t harm healthy trees or structures – they’re just hitchhiking, not parasitizing
  • Natural beauty: Their intricate patterns add subtle, understated beauty to garden surfaces

Should You Try to Grow It?

Here’s where things get interesting – you can’t really grow lichens in the traditional gardening sense. They’re not something you can buy at the nursery, plant with a trowel, and water regularly. Instead, they appear naturally when conditions are just right, almost like magic.

If you want to encourage lichens like Mycocalicium reticulatum in your garden, focus on creating lichen-friendly conditions:

  • Minimize chemical sprays and pesticides that might harm these sensitive organisms
  • Leave some older wood surfaces unfinished or untreated
  • Maintain good air circulation around trees and wooden structures
  • Be patient – lichens are slow growers and will colonize suitable surfaces in their own time

The Bottom Line

Reticulate mycocalicium lichen is one of those garden inhabitants that you might never notice until someone points it out – and then you’ll start seeing it everywhere! While you can’t cultivate it like your favorite flowers, appreciating its presence adds another layer of wonder to your outdoor space. Consider it nature’s way of decorating your garden with living art that also serves as a gentle reminder that your little patch of earth is healthy enough to support these remarkable organisms.

So next time you’re wandering through your garden, take a moment to look closely at tree bark and wooden surfaces. You might just discover you’ve been hosting this fascinating native lichen all along!

Reticulate Mycocalicium Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Caliciales

Family

Mycocaliciaceae A.F.W. Schmidt

Genus

Mycocalicium Vain. - mycocalicium lichen

Species

Mycocalicium reticulatum Nadv. - reticulate mycocalicium lichen

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