North America Native Plant

Requienella Subcollapsa

Botanical name: Requienella subcollapsa

USDA symbol: RESU2

Habit: lichen

Native status: Native to North America  

Requienella subcollapsa: A Mysterious Native Lichen Worth Knowing If you’ve ever wondered about the tiny, often overlooked organisms quietly doing their work in North American ecosystems, let me introduce you to Requienella subcollapsa. This native lichen might not be a household name (it doesn’t even have a common name that ...

Requienella subcollapsa: A Mysterious Native Lichen Worth Knowing

If you’ve ever wondered about the tiny, often overlooked organisms quietly doing their work in North American ecosystems, let me introduce you to Requienella subcollapsa. This native lichen might not be a household name (it doesn’t even have a common name that most people know!), but it represents the fascinating world of symbiotic organisms that play important roles in our natural landscapes.

What Exactly Is Requienella subcollapsa?

Requienella subcollapsa is a lichen—and if you’re scratching your head wondering what that means, you’re not alone! Lichens are remarkable partnerships between fungi and algae (or sometimes cyanobacteria) that work together as one organism. Think of them as nature’s ultimate roommates, each bringing something valuable to the relationship.

This particular lichen is native to North America, making it a legitimate part of our continent’s natural heritage. While we don’t have extensive documentation about its specific characteristics or distribution, it belongs to a group of organisms that have been quietly supporting ecosystem health for millions of years.

Is This Lichen Beneficial in Gardens?

Here’s where lichens get really interesting for gardeners! While you can’t exactly plant Requienella subcollapsa like you would a flower or shrub, lichens that naturally appear in your garden are generally excellent news. Here’s why:

  • They’re natural air quality indicators—lichens are sensitive to pollution, so their presence suggests clean air
  • They contribute to soil formation by slowly breaking down rock surfaces
  • They provide food and habitat for various small creatures
  • They add subtle beauty and texture to natural landscapes

How to Identify Lichens in Your Garden

Since detailed identification characteristics for Requienella subcollapsa aren’t widely documented, here are some general tips for recognizing lichens in your outdoor spaces:

  • Look for crusty, leafy, or branched growths on rocks, tree bark, or soil
  • Colors can range from gray and green to yellow, orange, or even bright red
  • They often appear after rain when they’re hydrated and more colorful
  • Unlike moss, lichens don’t have roots, stems, or leaves

Supporting Native Lichens in Your Landscape

While you can’t cultivate Requienella subcollapsa directly, you can create conditions that welcome native lichens:

  • Minimize chemical pesticide and fertilizer use
  • Leave some natural, undisturbed areas in your landscape
  • Maintain good air quality around your property
  • Allow natural substrates like rocks and mature tree bark to remain undisturbed

The Bigger Picture

Species like Requienella subcollapsa remind us that native gardening isn’t just about the showy flowers and dramatic trees. It’s also about appreciating and supporting the entire web of life, including the small, quiet organisms that keep ecosystems functioning. While we may not know everything about this particular lichen, its presence indicates a healthy, functioning natural system—and that’s something every gardener can celebrate.

Next time you’re in your garden, take a moment to look closely at the surfaces around you. You might just spot some lichens going about their ancient work, quietly contributing to the health of your little piece of North America.

Requienella Subcollapsa

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Pyrenulales

Family

Pyrenulaceae Rabenh.

Genus

Requienella Fabre

Species

Requienella subcollapsa (Ellis & Everh.) R.C. Harris

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