@phattysbox: The beer was not spontaneously fermented. And the beer where I put the dregs in either. Lets hope it not Candida....
I am very limited with my spare time right now but I will look at all the cells in more detail and try to use my oil immersion objective. And read about mycology

(as Wikipedia is down today... luckily the German version is still available). Thank you for your information. I guess I am at the right address here to get further ideas about my mysterious cells. I might name them X. mysteria

Cheers everyone