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These are hyphae of a still unknown fungus, forming a white large net-like mycelium. The total space occupied by these white to whitish threads was about 1/4 of square meter, and they were covering the upper surface of a tree stump, as well as a piece of wood discarded next to it.
Seen during my last weekend trek through mixed forest (oak, beech, spruce and fir) on a rolling hills at the feet of Jura range; Geneva lake valley.
Thanks Mark for help with the ID of these.