SafePlants

Cracked Lichen (Acarospora spp.)

The term "cracked lichen" is a common name applied to various species within the genus Acarospora. These lichens are known for their distinctive appearance, resembling cracked cobblestone or old, crazed paint.

Considerations for Pets

• The text mentions instances where skin conditions involving cracking and bleeding are referenced alongside the term "lichen". While not directly related to the lichen itself, be aware of potential sensitivities or skin irritations your pet may develop if they come into contact with the lichen, especially if they have pre-existing skin conditions. Observe your pet for any adverse reactions if they interact with surfaces where lichens grow.

Considerations for Children

• The cracked surface of the lichen, as described in the text, could present a minor physical hazard if small pieces detach or are ingested. While lichens are not typically considered highly toxic, it is advisable to supervise children when they are exploring areas where cracked lichens grow to prevent ingestion of any fragments.

Taxonomy and Nomenclature

• Scientific Name: Acarospora (Genus)
• Common Name: Cracked Lichen, Cobblestone Lichen
• Family: Acarosporaceae
• Kingdom: Fungi
• Phylum: Ascomycota
• Class: Lecanoromycetes
• Order: Agyriales
• Species Examples:
  • Acarospora aeruginosa Hasse
  • Acarospora albomarginata (Herre) Salisb.
  • Acarospora arenosa Herre
  • Acarospora badiofusca
  • Acarospora gallica
  • Acarospora hilaris
  • Acarospora impressula
  • Acarospora nodulosa
  • Acarospora schleicheri
  • Acarospora socialis
• Symbol: ACARO2

Distribution and Habitat

• Cracked lichens are found in various locations, including:
  • The Rocky Mountains (for Narcotic Lichen - although that might be a different species)
  • Britain and Ireland
  • Idaho
  • Planalto das Cezaredas, Portugal (for Acarospora nodulosa)
  • Olympic National Park
• They commonly grow on rocks, including granite, and can contribute to the weathering process.

Morphological Characteristics

• Cracked lichens typically have a crustose growth form.
• The thallus (lichen body) is often areolate, meaning it is divided into small, distinct areas or "islands."
• A continuous crust may crack during growth, creating a "cracked-areolate" appearance.
• The thallus initially forms as separate lumps that may eventually merge.
• Some species, like Buellia subalbula, have a white, cracked, and slightly frosted thallus.
• Some are bright yellow with angular aeroles.

Ecological Role

• Lichens, including cracked lichens, play a role in the weathering of rocks, slowly breaking them down over time.

Interactions with Other Organisms

• Cracked lichens can grow on various surfaces, including tree bark, sometimes alongside moss.

Quirky Facts

• One reference vaguely mentions "narcotic lichen" being rare and growing in desolate parts of the Rockies, with a humorous remark about a "sheep-based drug cartel." This alludes to a potentially interesting, although undeveloped, fact about the psychoactive properties of a specific lichen species.
• The text mentions a "Lichen T" sponsored by the Chicago, hinting at a social gathering or event focused on lichens, perhaps showcasing the community's interest in these organisms.