Cinclidotus riparius reinstated as a British and Irish moss

The occurrence of Cinclidotus riparius (Brid.) Arnott in the British Isles has been re-investigated. Vegetative material of this species can be separa ted from C. fontinaloides (Hedw.) P. Beauv. by the anatomy of the leaf bord er. It is shown that the early reports of C. riparius in the R. Teme in Eng land and the R. Fergus in Ireland were correct, and that the species is sti ll present in the R. Teme. The morphology, distribution and ecology of the species are discussed.