North America Native Plant

Sandstede’s Wart Lichen

Botanical name: Verrucaria sandstedei de

USDA symbol: VESA2

Habit: lichen

Native status: Native to North America  

Sandstede’s Wart Lichen: A Mysterious Native Crusty Character Meet Sandstede’s wart lichen (Verrucaria sandstedei), one of North America’s more elusive native inhabitants. If you’ve never heard of this particular lichen, don’t worry – you’re in good company! This crusty little organism is part of the fascinating world of lichens, those ...

Sandstede’s Wart Lichen: A Mysterious Native Crusty Character

Meet Sandstede’s wart lichen (Verrucaria sandstedei), one of North America’s more elusive native inhabitants. If you’ve never heard of this particular lichen, don’t worry – you’re in good company! This crusty little organism is part of the fascinating world of lichens, those remarkable partnerships between fungi and algae that quietly decorate our landscape in ways we often overlook.

What Exactly Is Sandstede’s Wart Lichen?

Sandstede’s wart lichen belongs to the Verrucaria genus, a group known for forming dark, warty-looking crusts on various surfaces. Like all lichens, it’s not actually a single plant but rather a symbiotic relationship between a fungus and algae working together as one organism. The wart in its name refers to the characteristic bumpy, crusty appearance that members of this genus typically display.

This particular species is what scientists call a crustose lichen, meaning it forms a crust-like layer that’s tightly attached to whatever surface it calls home. Think of it as nature’s living paint job – once it settles in, it’s there to stay!

Where Does It Come From?

Sandstede’s wart lichen is native to North America, though specific details about its exact range and distribution remain somewhat mysterious in the scientific literature. Like many specialized lichen species, it likely has specific habitat requirements that limit where you’ll find it thriving.

Is It Good for Your Garden?

Here’s where things get interesting! While you can’t exactly plant Sandstede’s wart lichen like you would a flower or shrub, its presence in your garden or landscape can actually be a positive sign. Lichens are excellent indicators of air quality and environmental health – they’re like nature’s own air quality monitors.

If this lichen shows up naturally in your outdoor space, it suggests you have relatively clean air and suitable growing conditions for these sensitive organisms. That’s definitely something to celebrate!

Benefits to Your Outdoor Space

While we don’t have specific information about what wildlife might benefit from Sandstede’s wart lichen, lichens in general provide:

  • Habitat and food for tiny invertebrates
  • Nesting materials for some birds
  • Indicators of ecosystem health
  • Natural beauty in their own subtle way

How to Identify It

Spotting Sandstede’s wart lichen requires a keen eye, as it’s likely to be quite small and unassuming. Based on its genus characteristics, look for:

  • Dark, crusty patches on rock surfaces or mineral-rich substrates
  • A warty or bumpy texture
  • Growth near water sources or in moist environments
  • A tight, paint-like adherence to its growing surface

The Bottom Line

Sandstede’s wart lichen represents one of those quiet, often-overlooked members of our native ecosystem. While you won’t be adding it to your shopping list at the garden center, appreciating these small-scale natural wonders can deepen your connection to the complex web of life in your outdoor spaces.

If you suspect you’ve found this or other lichens in your garden, consider it a badge of honor – it means your little corner of the world is healthy enough to support these fascinating organisms. Sometimes the best gardening achievement is simply creating conditions where native life can thrive on its own!

Sandstede’s Wart Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Verrucariales

Family

Verrucariaceae Eschw.

Genus

Verrucaria Schrad. - wart lichen

Species

Verrucaria sandstedei de Lesd. - Sandstede's wart lichen

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