Sciuro-hypnum flotowianum (Sendt.) Ignatov et Huttunen (Musci) en Pays de Caux (Seine-Maritime), nouveau pour l'ouest de la France

Sciuro-hypnum flotowianum (Sendt.) Ignatov & Huttunen (Musci, Brachytheciaceae) has been observed in a forest of Pays de Caux (Seine-Maritime, Upper Normandy, France), far away from its known European distribution area. The difficulties in identification of this pleurocarpous moss are discussed in comparison with S. populeum. Its distribution area in Europe and in some neighbouring countries of France is described; the French area is given more in detail, with a map. The status of this moss is discussed with respect to rarity, Red List status and conservation issues.