Young fruiting bodies of a rare species of lamella fungus , underwater, here photographed about 10-30 cm deep, on an oak beam covered with filamentous algae, zebra mussels, near Freshwater sponge colonies (Spongilla lacustris) in the Mid-Deûle river, in northern France. Air bubbles (probably produced by algae or photosynthetic sponges) are often "stuck" on the mushrooms. (Species = perhaps Psathyrella sp.? As in the United States?)