Vaucheria species from the Dutch brackish inland ponds “De Putten”

Data are given on the distribution and periodicity of fifteen Vaucheria species in three main types of habitat: a ditch, drainage ditches, and pond banks. At five stations a detailed analysis of Vaucheria growth was made. On the shores of the ponds from mean water level upwards, four groups of species can be discerned. The occurrence of most Vaucheria species shows a seasonal periodicity.