It´s might a Fuligo septica (http://en.wikipedia.org/wiki/Fuligo_s...). If it is a mold slime (for example Fuligo septica), then you´ve come across something unusual and very exciting! You see - what looks like one organism is actually many, many(!), organisms/individuals. And they are all kept together by a slime where they "live". Considering the fact that it consists of many organisms, you can actually see it move from one day to another. The colony will have changed position over night. This is called "Trollsmör" (troll butter) in Swedish.
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