Arthonia

Arthonia is a genus of lichens in the family Arthoniaceae. It was circumscribed by Swedish botanist Erik Acharius in 1806.

It is a genus of thin crustose lichen of widely varying forms, commonly called comma lichens.

Selectes species

 * Arthonia didyma
 * Arthonia ilicinella
 * Arthonia isidiata
 * Arthonia stereocaulina
 * Arthonia vinosa