The Charophyta of the Netherlands have been hitherto almost neglected. As far as I know only the following papers are dealing with the matter: VAN DEN BOSCH, R. B., in Ned. Kruidk. Archief 1, 1846, p. 100, p. 289. “II 1851 p. 225. both preliminary works to Prodromus Florae Batavae II, 2, 1853, p. 186—189. DE VRIES, H., Flora van Nederland, in Alg. Statist, v. Ned. I, 8, 1870, p. 39.