Horridocactus lissocarpus (F.Ritter) Backeb., Cactaceae 6: 3796. 1962 Horridocactus lissocarpus (F.Ritter) Backeb., Cactaceae 6: 3796. 1962is new combination for Pyrrhocactus lissocarpus F.Ritter in Succulenta (Netherlands) 1960: 17. 1960Taxon for this nameHorridocactus lissocarpus (F.Ritter) Backeb.