New facts on the occurrence and distribution of the threatened and rare stoneworts Chara baltica, C. connivens, C. contraria, C. virgata, Nitella hyalina, N. opaca, N. gracilis, N. capillaris, N translucens and N. flexilis and the non-threatened species Chara globularis in the northwestern part of Lower Saxony (Germany) are presented. A description of the stonewort sites is given and the abundance and the degrees of endangering of the species are discussed. Data about the Vegetation of the habitats of Nitella hyalina and N. opaca are reported. Additionally former sites of Chara canescens have been checked again. References to determination problems concerning Nitella opaca and N flexilis are given. Finally the protection of stoneworts, management requirements and the need for future investigations are discussed.

außerdem in laufender Nr. 5: Juncus bulbosus: +; Nr. 8: Peplis portula: 1, Myosotis scorpioides: 2, Alisma plantago-aquatica: +; Nr. 13: Chara virgata: +, Potamogeton pectinatus: 1, P. berchtoldii: +

Supplement to: Becker, Ralf (2010): Bemerkenswerte Characeen-Funde in Nordwest-Deutschland. Abhandlungen des Naturwissenschaftlichen Vereins zu Bremen, 46(3), 409-418