What kind of fungus is this? Seek science!

This is Flammulina velutipes. The fruiting body of Flammulina velutipes is thin and small. The cap is initially conical to bell-shaped, and then gradually expands outward, thin and 2.5-4cm in diameter. There is white fluff at the beginning, then it gradually falls off and turns gray. The radial ribs reach the top of the hat and the edge finally turns back. Mushroom meat is white and membranous. The bacterial folds are white, gray-black, free, narrow, and different in length. The stipe is slender, white, 10cm long and 0.3-0.5cm thick, brittle, with white fluffy scales falling off easily, and the stipe is hollow. Spores are oval, black, smooth, 9- 12.5 μ m× 6-9 μ m ... The pleats are large and bag-shaped.