This is with 100% certainty what in Europe is called Chamonixia caesptiosa. As we have only one hypogaeous fungus with such a blueing (Octaviania is becoming reddish-blackish, not blue) the determination is easy even macroscopically. The columella was evident, but I have no foto of the cut fruitbodies. Spores have been controlled microscopically and found to match perfect.