Mushrooms tend to slime over quite a bit and will usually not stay in place while using the toothpick or rubberband method. I have only had success using veil or mesh or by using a very tall container with some rubble.
Here is an interesting thread about propagating xenia -
http://www.fragoutpost.com/forums/showthread.php?t=19
be sure to watch the video.
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Oregon Dispensary