North America Native Plant

Phaeospora Parasitica

Botanical name: Phaeospora parasitica

USDA symbol: PHPA23

Habit: lichen

Native status: Native to North America  

Phaeospora parasitica: A Mysterious Native Lichen Worth Knowing If you’ve ever wondered about those curious crusty growths you spot on trees and rocks during your garden walks, you might have encountered a lichen. Today, we’re diving into the fascinating world of Phaeospora parasitica, a native North American lichen that’s more ...

Phaeospora parasitica: A Mysterious Native Lichen Worth Knowing

If you’ve ever wondered about those curious crusty growths you spot on trees and rocks during your garden walks, you might have encountered a lichen. Today, we’re diving into the fascinating world of Phaeospora parasitica, a native North American lichen that’s more interesting than its scientific name might suggest!

What Exactly Is Phaeospora parasitica?

Let’s clear up any confusion right away – Phaeospora parasitica isn’t a plant you can pop into your shopping cart at the garden center. It’s actually a lichen, which is a remarkable partnership between fungi and algae (and sometimes cyanobacteria too). Think of it as nature’s ultimate roommate situation, where everyone benefits from the arrangement!

This particular lichen calls North America home, making it a true native species that’s been quietly doing its thing in our ecosystems long before we started thinking about native gardening.

Is This Lichen Beneficial for Your Garden?

While you can’t exactly plant Phaeospora parasitica, its presence in your garden is actually a wonderful sign! Here’s why you should celebrate spotting this lichen:

  • Air quality indicator: Lichens are sensitive to air pollution, so their presence suggests you’ve got clean air in your garden space
  • Ecosystem health: They contribute to biodiversity and provide habitat for tiny creatures
  • Natural beauty: Lichens add subtle texture and interest to tree bark and rocky surfaces
  • Soil building: Over time, lichens help break down rock surfaces, contributing to soil formation

How to Identify Phaeospora parasitica

Spotting this particular lichen can be tricky since detailed identification often requires microscopic examination. However, if you’re curious about lichens in general, here are some tips for lichen watching in your garden:

  • Look for crusty, leafy, or shrub-like growths on tree bark, rocks, or soil
  • Check colors ranging from gray and green to yellow, orange, or even bright red
  • Notice their slow-growing nature – they’re not in any hurry!
  • Observe how they seem to paint surfaces rather than growing up from them like plants do

Creating a Lichen-Friendly Garden

While you can’t plant Phaeospora parasitica directly, you can certainly encourage lichens to thrive in your garden naturally:

  • Maintain clean air: Avoid using harsh chemicals and support air quality in your area
  • Preserve mature trees: Older trees with established bark provide perfect lichen habitat
  • Include natural stone: Rock gardens and stone features give lichens places to establish
  • Be patient: Lichens grow incredibly slowly, so think in terms of years, not seasons
  • Avoid disturbance: Once lichens establish, leave them be – they don’t like to be moved or disturbed

The Bottom Line on This Native Lichen

Phaeospora parasitica might not be the showstopper flowering native you can order online, but it represents something equally valuable – the quiet, steady presence of native species that keep our ecosystems healthy. If you spot lichens in your garden, consider yourself lucky to be hosting these ancient partnerships.

Rather than trying to cultivate this specific lichen, focus on creating conditions that welcome all sorts of native lichens and mosses. Your garden will thank you with increased biodiversity, and you’ll have the satisfaction of supporting native species that have been perfecting their survival strategies for millions of years.

Next time you’re wandering through your garden, take a moment to appreciate these small but mighty organisms. They’re proof that some of the most fascinating native species are hiding in plain sight, quietly contributing to the health and beauty of our outdoor spaces.

Phaeospora Parasitica

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Ascomycetes

Subclass
Order

Verrucariales

Family

Verrucariaceae Eschw.

Genus

Phaeospora Hepp ex Stein - phaeospora

Species

Phaeospora parasitica (Lonnr.) Arnold

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