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disc lichen

Scientific Name: Buellia caloosensis

Family: Physciaceae

Category: Lichen

Growth: Lichenous

Duration:

Other Names:

       

Disc Lichens (Genus Buellia)

Disc lichens, also known as button lichens, belong to the genus Buellia. This genus is widespread and includes approximately 450 species.

Considerations for Pets

  • Some Buellia species may contain necrotic thalline material.

Considerations for Children

  • Disc lichens may have small, disc-shaped apothecia (fruiting bodies) that could present a choking hazard if detached.

Taxonomy and Nomenclature

  • Scientific Name: Buellia De Not.
  • Common Names: Disc lichen, Button lichen, Stilling's Disc Lichen, Common Button Lichen, Black Disc Lichen, Rock Disk Lichen
  • Family: Physciaceae (for at least one species, Buellia nigra)
  • Synonyms: Buelliopsis papillata (for Buellia papillata)

Distribution and Habitat

  • The genus has a widespread distribution.
  • Specific locations mentioned include: Diamond Coast, Howard Co., Chiricahua National Monument, South Glenmore Park, New Hampshire, England, Kola Peninsula, and the Himalayas.

Morphological Characteristics

  • Lichens in this genus exhibit a range of colors, including yellow, black, brown, and gray-green.
  • They possess disc-shaped apothecia (fruiting bodies) that are involved in sexual reproduction. These apothecia can be epruinose (without a powdery surface) or pruinose (with a powdery surface).
  • The thallus (main body of the lichen) can be crustose, growing closely attached to the substrate.
  • Some species have disc-shaped apothecia with rims around the edge.
  • Some lichens form strongly twisted rows of separate discs.

Ecological Role

  • Reindeer lichen species re-establishment rate has been studied following disc trenching and HuMinMix soil preparation in Pinus-lichen clear-cut areas.

Interactions with Other Organisms

  • Mention of lichens growing on a live poplar tree alongside Lecanora species.

Antimicrobial Activity

  • Some extracts from the lichen have potential antifungal effect.
  • Antifungal activity has been analyzed using the Bauer-Kirby disc diffusion assay.

Further Information

  • Catalogue of Life: 2012 Annual Checklist
  • British Lichen Society - BLS Lichen Database