Rinodia calcigena (Th. Fr.) Lynge belongs to the R. bischoffii- rather than to the R. bicincta-group of species. It is most closely related R. castanomelodes Mayrh. and Poelt but is allopatric with it. Rinodina endophragmia Lamb, described from the Antarctic, is a bipolar species and R. arnoldii Mayrh. and Poelt is also recorded from the Arctic for the first time. Rinodina endophragmia, now found to be widely distributed in West Greenland, it compared to R. straussii Steiner emend. Mayrh. and to R. castanomela (Nyl.) Arnold. These species all belong to the Rinodina bincincta-group. Rinodina ochracea Lynge also has bicincta-type spores but is less widespread and has smaller spores with more darkly pigmented and refractive bands around the cells than R. endophragmia.