SafePlants

Disc Lichen (Buellia spp.)

Lichens in the genus Buellia are commonly known as disc lichens or button lichens.

Considerations for Pets

• Some disc lichens have disc-shaped apothecia that may contain substances extracted using solvents like acetone, methanol, and ethanol.

Taxonomy and Nomenclature

• Scientific Name: Buellia spp.
• Common Names: Disc lichen, button lichen, common button lichen, black disc lichen, rock disk lichen, sunken disc lichen.
• Family: Physciaceae (mentioned in relation to Buellia nigra)
• Synonyms: Buelliopsis papillata (for Buellia papillata)

Distribution and Habitat

• The genus Buellia has a widespread distribution.
• Observed on the Diamond Coast (South Africa).
• Found in Chiricahua National Monument.
• Observed in Howard County.
• Found on live poplar trees in South Glenmore Park.

Morphological Characteristics and Growth Habits

• Disc lichens possess a necrotic thalline veil, which can be thin and persistent.
• The "disc" is often black and epruinose (lacking a powdery surface coating).
• Apothecia (fruiting bodies) are commonly disc- or saucer-shaped.
• Some species exhibit circular, yellow disk-like structures (apothecia).
• Lichens are classified into growth forms, with some being generally shaped like a disc.
• Some lichens grow closely attached to the substrate in a crustose manner.

Interactions with Other Organisms

• Mentioned in the context of reindeer lichen species re-establishment after soil preparation with pine.
• Some lichen extracts show potential antifungal effects.

Quirky Facts

• The identification of lichens can be aided by noting the color of the disc.
• The Downs lichen trail was funded by the British Lichen Society.

Resources and Further Information

• Catalogue of Life: 2012 Annual Checklist
• Botanical Society of South Africa
• NEBC LICHEN WALK