Main answer

This is called a ghost umbrella, and it can be commercialized now. The product is Coprinus comatus, which is delicious and has certain medicinal value and can be used to treat hemorrhoids.

Coprinus comatus is a kind of grass rot fungus. There are many plant fibers here, which will produce fruiting bodies, and its mycelium adapts to the temperature of 5 to 30 degrees. The temperature at which fruiting bodies occur is generally around 20 degrees.