Didymodon mamillosus (Crundw.) M. Hill (Musci, Pottiaceae) dans les Hautes-Alpes, espèce nouvelle pour la France

Abstract Didymodon mamillosus (Crundw.) M. Hill has been collected for the first time in France in the Hautes-Alpes. The plant is illustrated and compared with the original description. Ecological details and a map showing the position of the French locality are given.