Coscinodon Sprengel, 1804.

Coscinodon, with its sister genus Jaffueliobryum, has a plicate and campanulate calyptra as well as a peristome with equal thickening of the outer and inner layers. The two genera have cribrose peristome teeth which remain erect rather than flexing outward from the capsule when dry. We key Coscinodon in Grimmia because none of the gametophytic characters of Coscinodon would alert one to look outside of Grimmia for identification.
see key to Grimmia Etc.

Species included:
Coscinodon calyptratus (W. J. Hooker in Drummond) C. E. O. Jensen ex Kindberg