The voucher specimens of Racomitrium aquaticum (Schrad.) Brid. from the Russian Far East and Central Siberia in Asiatic Russia are re-assessed and some details of their gametophytes are illustrated. It is concluded that they represent muticous ecads of R. sudeticum (Funck) Bruch & Schimp. Accordingly, R. aquaticum is withdrawn from the moss flora of mainland Asia.