To get your own fungus
t involves removing a small part of the root/rhizoid and placing it on one edge of a petri dish with media in it, the fungus and what every else is there will grow. Once the fungus has grown to the other side, A small piece of the media with the fungus on it is removed from the far side to where you put the rhizoid. this will be moved to a new Petri dish, (which was placed at an angle so that the media does not cover all the base when it was poured in) a few millimetres away from the media, the fungus should be able to reach across the gap and start growing on the media. this process is repeated until you get only the fungus growing on the media.
I have never managed to get a usefully fungus