The mushrooms aren't really a problem. Soil contains multitudes of complex organisms including bacteria and fungus that benefit the plants growing in it. Your soil is fine.


As for cloning. This as a killer thread on a different forum. And is a technique that I'm using to keep my strains around without taking up too much space, there's good info on cloning in there too. It's pretty easy over all.
Bonsai Mums: A Guide - Grasscity.com Forums

Once you get good,... look into this!
grafting marijuana - Videos - The WEED Report