North America Native Plant

Zwackhiomyces Lichen

Botanical name: Zwackhiomyces dispersus

USDA symbol: ZWDI

Habit: lichen

Native status: Native to North America  

Synonyms: Pharcidia dispersa (J. Lahm ex Körb.) Winter ex Rabenh. (PHDI14)   

Zwackhiomyces Lichen: The Tiny Parasite You’ve Probably Never Noticed If you’re a curious gardener who loves discovering the hidden world of tiny organisms in your landscape, you might be intrigued to learn about zwackhiomyces lichen (Zwackhiomyces dispersus). This isn’t your typical garden addition – in fact, you can’t plant it ...

Zwackhiomyces Lichen: The Tiny Parasite You’ve Probably Never Noticed

If you’re a curious gardener who loves discovering the hidden world of tiny organisms in your landscape, you might be intrigued to learn about zwackhiomyces lichen (Zwackhiomyces dispersus). This isn’t your typical garden addition – in fact, you can’t plant it even if you wanted to! Instead, this fascinating little organism represents one of nature’s more unusual relationships.

What Exactly Is Zwackhiomyces Lichen?

Zwackhiomyces dispersus is a parasitic lichen that makes its living by growing on other lichens. Unlike the familiar crusty or leafy lichens you might spot on tree bark or rocks, this species is what scientists call a lichenicolous fungus – essentially a lichen that parasitizes other lichens. Think of it as nature’s version of a tiny hitchhiker.

This native North American species was previously known by the scientific name Pharcidia dispersa, but taxonomists have since reclassified it. Don’t worry – even lichen experts sometimes struggle to keep up with name changes!

Where Can You Find It?

As a native species to North America, zwackhiomyces lichen occurs naturally across the continent, though specific distribution details remain somewhat mysterious. Like many microscopic organisms, it’s probably more widespread than we realize – we just don’t notice it very often.

Is It Beneficial for Your Garden?

Here’s where things get interesting. While you won’t be adding zwackhiomyces lichen to your shopping list anytime soon, its presence can actually tell you something valuable about your garden’s health. Lichens in general are excellent indicators of air quality, and a diverse lichen community (including parasitic ones like this) suggests you’re maintaining a relatively clean, healthy environment.

The benefits include:

  • Indicator of good air quality in your garden area
  • Part of the complex web of biodiversity that supports healthy ecosystems
  • Contributes to the natural balance of lichen communities

How to Identify Zwackhiomyces Lichen

Honestly, identifying this particular species requires a microscope and considerable expertise. As a parasitic lichen, it appears as tiny growths on its host lichens rather than forming the obvious crusts, leafy structures, or branching forms we typically associate with lichens.

If you’re curious about the lichen community in your garden, start by learning to identify the more obvious host lichens first. Once you develop an eye for the common species, you might begin to notice unusual growths or discolorations that could indicate the presence of parasitic species like zwackhiomyces lichen.

The Bottom Line for Gardeners

While zwackhiomyces lichen isn’t something you can cultivate or manage directly, its potential presence in your garden is actually a good sign. It suggests you’re maintaining an environment clean enough to support diverse lichen communities.

If you want to encourage lichen diversity in your landscape, focus on:

  • Minimizing air pollution and chemical use
  • Maintaining mature trees and natural surfaces where lichens can establish
  • Avoiding unnecessary cleaning of bark and stone surfaces
  • Supporting overall ecosystem health through native plantings

So next time you’re wandering through your garden, take a moment to appreciate the incredible diversity of tiny organisms sharing your space – including the fascinating parasitic lichens you probably never knew existed!

Zwackhiomyces Lichen

Classification

Group

Lichen

Kingdom

Fungi - Fungi

Subkingdom
Superdivision
Division

Ascomycota - Sac fungi

Subdivision
Class

Uncertain Ascomycota Class

Subclass
Order

Uncertain Ascomycota Order

Family

Uncertain Ascomycota Family

Genus

Zwackhiomyces Grube & Hafellner - zwackhiomyces lichen

Species

Zwackhiomyces dispersus (J. Lahm ex Körb.) Triebel & Grube - zwackhiomyces lichen

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