Arthonia is a genus of lichens in the family Arthoniaceae.[1] 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.[2]: 222
Photograph of a cross section of an apothecium of A. caesia taken through a compound microscope, x 400.
Photograph of two spores (3-septate, 4-celled) from Arthonia caesia taken through a compound microscope, x 1000. (spores measure 21 x 5 micrometres)
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.: 222
