Isopogon ceratophyllus, commonly known as the horny cone-bush or wild Irishman, is a plant of the family Proteaceae that is endemic to the coast in Victoria, South Australia and on the Furneaux Group of islands in Tasmania. It is a small woody shrub that grows to 100 cm high with prickly foliage. It is extremely sensitive to dieback from the pathogen Phytophthora cinnamomi