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Thanks for your comprehensive comment TheMiesMeister! I was already holding back on the ID of Hygrocybe Perplexa because of its rarity. I'll will give it the Flammulina Velutipes ID for now. Thanks!
Nope, in no way this is a Hygrocybe. In the Netherlands they grow solely in grasslands/meadows where they have never used chemical fertilizer (Check this out, there is a special reserve made for these mushrooms in Friesland less then a year ago: http://www.natuurbericht.nl/?id=11657). Never do they grow on wood. And also the species you suggested, has been recorded only 10 times in the Netherlands, last seen in 1984 (source: http://www.verspreidingsatlas.nl/0059240...). This could most likely be Flammulina velutipes (Fluweelpootje), based on cap colour, the waxy/slimy texture of the smooth capsurface, the big distance between the gills, the moment you have found it (in the winter) and the fact that it grows on wood. I am 99,9% sure, because I've seen this one quite a lot and there are few other woodinhabiting mushrooms which look like it from the top, but they do not grow in winter! Though, without seeing the stem, it is not a full ID for me.
Lat: 51.94, Long: 4.61
Spotted on Jan 19, 2014 Submitted on Jan 19, 2014