North America Native Plant

Leproloma Lichen

Botanical name: Leproloma membranaceum

USDA symbol: LEME13

Habit: lichen

Native status: Native to North America  

Synonyms: Amphiloma lanuginosum (Hoffm.) Nyl. (AMLA8)  ⚘  Lepraria membranacea (Dicks.) Vain. (LEME18)   

Leproloma Lichen: A Natural Air Quality Indicator for Your Garden Have you ever noticed those greyish-green, papery patches growing on the bark of your mature trees? If you’re lucky enough to have clean air in your area, you might be looking at leproloma lichen (Leproloma membranaceum) – a fascinating organism ...

Leproloma Lichen: A Natural Air Quality Indicator for Your Garden

Have you ever noticed those greyish-green, papery patches growing on the bark of your mature trees? If you’re lucky enough to have clean air in your area, you might be looking at leproloma lichen (Leproloma membranaceum) – a fascinating organism that’s actually doing you a favor by indicating the health of your local environment!

What Exactly Is Leproloma Lichen?

First things first – leproloma lichen isn’t actually a plant at all! It’s a lichen, which is a unique partnership between fungi and algae working together in perfect harmony. This particular species, also known by its scientific synonyms Amphiloma lanuginosum and Lepraria membranacea, is native to North America and has been quietly going about its business on tree bark for centuries.

Unlike the plants we typically think about for our gardens, lichens are completely self-sufficient. They don’t need soil, fertilizer, or watering – they get everything they need from the air and rain around them.

Where You’ll Find This Remarkable Organism

Leproloma lichen is native to North America and thrives in temperate and boreal regions across the continent. You’re most likely to spot it in areas with good air quality, making it somewhat of a natural environmental monitor.

How to Identify Leproloma Lichen

Spotting leproloma lichen is easier than you might think once you know what to look for:

  • Appearance: Thin, membranous patches that look almost papery or crusty
  • Color: Greyish-green to bluish-grey, sometimes with a slightly powdery appearance
  • Habitat: Growing directly on tree bark, particularly on older, established trees
  • Texture: Smooth to slightly granular surface that may peel or flake at the edges

Is Leproloma Lichen Beneficial for Your Garden?

Absolutely! While you can’t plant or cultivate leproloma lichen (it establishes itself naturally), having it in your garden is actually a wonderful sign. Here’s why you should be happy to see it:

  • Air quality indicator: The presence of lichens like leproloma suggests your local air quality is good – they’re sensitive to pollution and won’t survive in heavily polluted areas
  • Adds natural character: These lichens give mature trees an authentic, woodland appearance that money can’t buy
  • Completely harmless: They don’t damage trees or compete with your other plants
  • Low maintenance: They require absolutely no care from you!

Creating Conditions Where Lichens Thrive

While you can’t plant leproloma lichen directly, you can encourage its natural establishment by:

  • Maintaining mature trees in your landscape
  • Avoiding the use of harsh chemicals or pesticides near trees
  • Supporting local air quality initiatives
  • Being patient – lichens establish very slowly over many years

Perfect for Naturalistic Gardens

If you’re cultivating a woodland garden or naturalistic landscape, leproloma lichen is the kind of authentic detail that makes all the difference. It’s particularly suited for:

  • Established woodland gardens with mature trees
  • Natural areas where you want to maintain an undisturbed appearance
  • Educational gardens where you want to showcase native ecosystems

The Bottom Line

Leproloma lichen is one of those wonderful garden inhabitants that you don’t need to worry about – it either shows up naturally (which is great!), or it doesn’t (which might tell you something about your local environment). If you’re blessed with its presence, consider yourself lucky to have both clean air and a little piece of natural history growing right in your backyard. And if you don’t see it yet? Focus on creating a healthy, mature landscape and supporting clean air initiatives – the lichens will find you when the time is right!

Leproloma Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Pannariaceae Tuck.

Genus

Leproloma Nyl. ex Crombie - leproloma lichen

Species

Leproloma membranaceum (Dicks.) Vain. - leproloma lichen

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