I've never seen this fascinating fungus. It has seven rubbery "arms" like a star-fish, and in the exact center, a mushroom-like ball that looks like a medium sized marshmallow. I took it home, and as it dried, the arms closed around the soft "marshmallow" and lost their rubberiness. It reminds me of a cotton boll. When I sat it in a plate of water, the "arms" opened and became rubbery and it stood up on the points of the arms to not get too wet. What is it????