In post #2, I mentioned bamboo pith fungus. What I failed to mention was that these come in two forms. There are the adult mushrooms with their lace-like veil
but the immature fruiting bodies are egg shaped and are sold as "bamboo fungus eggs" (竹荪蛋 zhú sūn dàn).
These are soaked in hot water for half an hour, then braised, fried or used in soups.
(P.S. I'm still working on the 48 mushroom menu translation. Soon, I hope.)