Inoculate spores into agar dish. I like agar in petri dishes as it is easy to keep sterile.
Identify strongest looking patch of white strands (this is your Dikaryotic/Rhizomorphic Mycelium).
Isolate the Dikaryotic mycelium (the most thick/layered area). Let that grow out in a sterile enviroment.
Congratulations, you have now isolated the strongest/most vigorous spore combination.
