I was following a TV document handling Chinese black hair looking , moss resembling food stuff called Fat Choy .Studying more the "plant", which it is not at all, I found out that it is a bacteria belonging to the family of cyanobacterium. It grows in China near the Gobi desert and appears after the rains. So here is one similarity, with a "mushroom" which comes up after heavy rains here in my place in SE Spain. I have seen it more always when the dry and hot period has ended. It is black, thin and resembles gelatin. I think it can be also some kind of cyanobacterium, maybe same family as Fat Choy ( Nostoc flagelliforme)
Jouko Ofverberg