The treatment of Racomitrium follows Larraín et al. (2013), who used molecular evidence for a broad treatment of the genus. Sawicki et al. (2015) used mitochondrial DNA to support narrower genera. However, they used only ten species of Racomitrium s.lat. (two from each segregate genus), and the results did not contradict the previous treatment. Indeed, significant problems remain (e.g. Bucklandiella sensu Ochyra is not monophyletic) and until Racomitrium s.lat. is more completely treated, we prefer to retain Racomitrium in a broad sense.