North America Native Plant

Solenospora Lichen

Botanical name: Solenospora holophaea

USDA symbol: SOHO3

Habit: lichen

Native status: Native to North America  

Synonyms: Candelariella holophaea (Mont.) Zahlbr. (CAHO20)  ⚘  Lecanora holophaea (Mont.) Nyl. (LEHO6)   

Solenospora Lichen: The Tiny Crusty Helper You Didn’t Know You Had Have you ever noticed those thin, crusty patches on rocks in your garden or local hiking trails? Meet the solenospora lichen (Solenospora holophaea), a fascinating organism that’s doing more for your landscape than you might realize! This unassuming little ...

Solenospora Lichen: The Tiny Crusty Helper You Didn’t Know You Had

Have you ever noticed those thin, crusty patches on rocks in your garden or local hiking trails? Meet the solenospora lichen (Solenospora holophaea), a fascinating organism that’s doing more for your landscape than you might realize! This unassuming little life form is actually a remarkable partnership between fungi and algae, working together to create something pretty special in the natural world.

What Exactly Is a Solenospora Lichen?

Before we dive deeper, let’s clear up what we’re looking at here. Solenospora holophaea isn’t a plant in the traditional sense – it’s a lichen! Think of lichens as nature’s ultimate roommate situation: a fungus and an algae (or sometimes cyanobacteria) living together in perfect harmony. The fungus provides structure and protection, while the algae whips up food through photosynthesis. It’s like having a chef and a landlord rolled into one tiny organism.

This particular lichen goes by a few scientific aliases too – you might see it listed as Candelariella holophaea or Lecanora holophaea in older field guides. But don’t worry, they’re all referring to the same crusty little character!

Where You’ll Find This Native Wonder

Solenospora holophaea is a proud North American native, particularly at home in the western regions of the United States. You’ll typically spot it making itself comfortable on rock surfaces in more arid and semi-arid areas – basically anywhere there are rocks and not too much moisture.

Spotting Solenospora Lichen in the Wild

Ready to become a lichen detective? Here’s what to look for:

  • Thin, crusty patches that look almost painted onto rock surfaces
  • Colors ranging from gray to whitish – nothing too flashy here
  • Grows directly on bare rock, forming patches that can slowly expand over time
  • Most commonly found in drier climates where they won’t be competing with mosses and other moisture-loving organisms

Is This Lichen Good for Your Garden?

Here’s the cool part – if you’ve got solenospora lichen naturally occurring in your landscape, you’re actually hosting some pretty beneficial residents! While you can’t exactly plant or cultivate lichens (they do their own thing, thank you very much), having them around is generally a good sign.

Lichens like Solenospora holophaea contribute to their ecosystems in several quiet but important ways:

  • They help break down rock surfaces over time, contributing to soil formation – it’s like having tiny geological assistants!
  • They can indicate good air quality, as many lichens are sensitive to pollution
  • They provide food and shelter for small insects and other tiny creatures
  • They add to the biodiversity of your landscape without taking up space that other plants need

The Care and Feeding of Lichens (Spoiler: There Isn’t Any)

One of the best things about lichens is that they’re the ultimate low-maintenance landscape residents. You literally cannot and should not try to care for them. They’ve been doing their thing for millions of years without our help, and they prefer to keep it that way.

If you’re lucky enough to have natural rock features in your landscape where these lichens can establish themselves, the best thing you can do is simply leave them alone. Avoid power washing rocks, using harsh chemicals nearby, or disturbing their rocky homes.

The Bottom Line on Solenospora Lichen

While you won’t be adding solenospora lichen to your shopping list at the local nursery, appreciating and protecting these fascinating organisms when they occur naturally is a wonderful way to support native biodiversity. They’re like the quiet neighbors who keep to themselves but contribute positively to the whole community.

Next time you’re out in your garden or exploring natural areas, take a moment to appreciate these crusty little partnerships. They may not be showy like your favorite flowering natives, but they’re doing important work in their own understated way. And honestly, in a world of high-maintenance garden plants, isn’t there something refreshing about an organism that asks for absolutely nothing but gives back to the ecosystem anyway?

Solenospora Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Lecanorales

Family

Bacidiaceae Walt. Watson

Genus

Solenospora A. Massal. - solenospora lichen

Species

Solenospora holophaea (Mont.) G. Sampaio - solenospora lichen

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