Phylum: Charophyta   Family: Desmidiaceae

Actinotaenium silvae-nigrae  (Rabanus) Kouwets & Coesel

An oligotrophic species with poorly known distribution

References: 
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands
Kouwets, F.A.C. (1999) A check-list of desmids (Chlorophyta, Zygnemaphyceae) of France