It is preliminary and subject to frequent revision. See also the forthcoming paper in Bryologist concerning a treatment of the group including several new species. The treatment of this group was in collaboration with Ingvar Karnefelt.
American species are in bold .
C. cladodes 2 . Thallus orange, coarse, lobes 0.3-0.5 mm diam. C. obliterans 6 . C. cupulifera 7 . C. proteus 9 .