For the yuma, just get a small plastic container (or even a shot glass) and fill the bottom with rubble then place the yuma in there on top of the rubble and cover the top with some bridal veil (or something similar) and after about a week it should be attached.
For the Green mushroom, you can frag it. The easiest way is to cut the disc off of the stem of the mushroom and then cut the disc in half down the middle (including part of the mouth for each half) with a sharp razor blade and then place the halves in a container for them to heal and attach to rubble (just like I explained for the yuma). Each half will form a new mushroom and the "stem" part that was left on the rock will form a new mushroom too, so 1 becomes 3.