Moss is tricky, it is sensitive to bright light, most (all?) kinds of moss are more or less plants preferring the shadow, so it might be difficult to keep it alive in a brightly lit enclosure.
For the other plants have a look-->
http://www.ssnakess.com/forums/natur...errariums.html
My enclosures for the tiger ratsnakes (Spilotes pullatus) and the red tailed green ratsnakes (Gonyosoma oxycephalum) have a humidity of 90% or even more and all plants I described are growing quite good.
Roman