What is "buellia"

Buellia is a genus of fungi in the family Caliciaceae. The fungi are usually part of a crustose lichen. In this case, the lichen species is given the same name as the fungus. But members may also grow as parasites on lichens ( lichenicolous). The algae in the lichen is always a member of the genus Trebouxia.

Lichens in the genus are commonly called disc lichens, or button lichens. The genus has a widespread distribution and contains about 450 species.

Genetic studies indicates that the genus Amandinea and Buellia may be the same, although this is not widely accepted.