couple of things - just because I like details to be correct :-)

Mycelium is not a type of mushroom It is the name given to the main body of ALL fungi.
The mushrooms are just the 'fruit' of the mycelium. The actual organisim is composed of the mycelium.

So everywhere in the article you've put: mycelium fungus. You just need to have mycelium.

Looking at that image, he's using a variety of oyster mushroom. Might as well be edible :-)

Very very clever.

Get him and the tree man together and you could have grown furniture that also grows food :-)