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Unfortunately Hieracium piloselloides is extinct in Schleswig-Holstein, extremly rare in Mecklenburg-Vorpommern and so far never recorded from Zingst. There is only one single record of this plant from German Baltic coast (in 1985 http://www.floraweb.de/webkarten/karte.html?taxnr=2924). Another reason that my vote is going for N. pupillata only.
Very best regrads
Piet