lichen
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.fungi in the family
Physciaceae
The Physciaceae are a family of mostly lichen-forming fungi belonging to the class Lecanoromycetes in the division Ascomycota. A 2016 estimate placed 19 genera and 601 species in the family.
Genera
This is a list of the genera contained within ...
. The genus has a widespread distribution and contains about 265 species. It is hypothesized that a few saxicolous species common to dry regions of western North America, southern Europe, North Africa and central Asia may date back 240 million years to the Middle Triassic.