Two unique looking alage specimens

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Taken from the same sample as my two slow motion posts, a bottle of pond water sitting on a window sill.
The "8" shaped guy is just about 20 micron long. And in the cluster, they are each about 14 micron wide or so.

I believe this one is a Pediastrum duplex, made up of 8 cells

Couldn't tell you much of anything about this guy, other than it is shaped like an 8.

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Hi,

Pediastrum duplex: ok

THe other one is a Cosmarium spec., but which one ?

greetz,
Wim