SafePlants

Cracked Lichen

The term "cracked lichen" refers to various lichen species characterized by a distinctive cracked or cobblestone-like appearance. They are also sometimes called cobblestone lichens.

Considerations for Pets

• The text mentions that lichens can grow on rocks and wood, sometimes contributing to the breakdown of these surfaces. While not directly stated, be aware of the potential for pets to ingest small fragments of lichen while outdoors.

Considerations for Children

• The "cracked" texture of these lichens may make them tempting for children to pick at or handle.

Scientific Name and Taxonomy

• Several Acarospora species are referred to as "cracked lichen."
• Scientific Name: Various, including Acarospora hilaris, Acarospora schleicheri, Acarospora aeruginosa, Acarospora arenosa, Acarospora gallica, Acarospora nodulosa, Acarospora impressula, Acarospora badiofusca, and Acarospora socialis.
• Family: Acarosporaceae
• Kingdom: Fungi
• Phylum: Ascomycota
• Class: Lecanoromycetes
• Order: Agyriales
• Genus: Acarospora

Distribution and Habitat

• Narcotic lichen (species unspecified) is rare and grows in desolate parts of the Rockies.
• Schleicher's Cracked Lichen (Acarospora schleicheri) can be found in the Rocky Mountains.

Morphological Characteristics

• Cracked lichens often have a "cracked-areolate" thallus, where a continuous crust cracks during growth.
• The lichen thallus may start as separate lumps that grow together, forming a continuous cracked surface.
• Some species, like Buellia subalbula, have a white, cracked thallus that appears frosted.
• Acarospora socialis has angular, bright yellow aeroles with small, darker apothecia immersed in the aeroles.

Ecological Role

• Lichens, including cracked lichens, contribute to the weathering of rocks. They slowly break down rock surfaces.