Cladonia deformis, also known as the lesser sulphur cup or the lesser sulphur cup lichen, is a light-coloured, fruticose, cup lichen belonging to the family Cladoniaceae.[1] This lichen was first described as Lichen deformis by Carl Linnaeus in 1753, and transferred to the genus Cladonia in 1796 by Georg Franz Hoffmann.[2] [3]
As of July 2021, its conservation status has not been estimated by the IUCN. In Iceland, its conservation status is denoted as data deficient (DD).