Lifestage Dictyocha?

What is this? Any suggestions?

I found this in Danafjord on the Swedish Westcoast 9/3 2012



A very skilled collegue of mine found this species in Guide d'identification du phytoplancton marin de l'estuaire et du golfe du Saint-Laurent. Diplostauron aff. elegans, class Chlorophyceae