I'm far from confident about this suggested identification, it could be a Mycena (such as Mycena pura) but something about the gills doesn't seem quite right.
Perhaps an Entoloma or a Mycena, as you say, but, in the absence of information about spore colour, it's one of those small, whitish, featureless mushrooms that I'm wary of identifying from a photo. Since they are such good photos, I file this under Agaricales for now, in the hope that some insight will strike in the future.
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