SafePlants

Ravenel's Dot Lichen (Arthonia ravenelii)

Ravenel's Dot Lichen, scientifically known as Arthonia ravenelii, is a fascinating lichen belonging to the Arthoniaceae family. It is also commonly referred to as Ravenel's dot lichen.

Considerations for Pets

• As a lichen, it may grow on various surfaces, including those accessible to pets. While lichens are not typically considered highly toxic, ingestion could potentially cause gastrointestinal upset in sensitive animals.

Considerations for Children

• Lichens may grow on surfaces that children could touch or ingest. Although generally not considered highly toxic, ingestion could cause discomfort in some children.

Taxonomy and Nomenclature

• Scientific Name: Arthonia ravenelii Tuck.
• Common Name: Ravenel's Dot Lichen
• Family: Arthoniaceae
• Genus: Arthonia Ach. (dot lichen)
• Synonyms: Bacidia ravenelii (Tuck.) Zahlbr.

Distribution and Habitat

• The lichen is found in the United States, including South Carolina, where it was collected by Ravenel.
• It is also present in Australia.

Morphological Characteristics and Growth Habits

• Ravenel's Dot Lichen is lichenous in its growth habit, meaning it forms a symbiotic relationship between a fungus and an alga or cyanobacterium.
• The thallus (lichen body) can be light to dark tan with numerous imbedded black dots (perithecia).

Quirky Facts

• The lichen is named after Ravenel, a collector who found it in South Carolina.

Interactions with Other Organisms

• Echinothecium, a type of sooty mould, has been found to occur on lichens.

Further Information

• The United States Department of Agriculture (USDA) is a resource for information.
• The Australian New Crops Web Site provides information about its presence in Australia.