I use NZ sphagnum moss to put roots on rootless Paphs and Phrags. I use a large, black nursery pot and fill it to about 4" deep with styrofoam peanuts. Then, I gently drop, little by little, a layer of moss on top, to a depth of about 2". The moss is soaked and squeezed out; then it's fluffed up. I tease the long strands out and just let gravity pull them down on top of the thick layer of peanuts. I do not do ANY pressing down at all; although, I do use my fingers to shift the strands sideways so that the moss is evenly distributed on top of the styrofoam peanuts. I keep doing that until there's a very open, fluffy ~2" thick layer of moss on top. Then, using a finger, I gently "drill" holes in the moss and place the rootless base of the plants in the holes. You can do this with a 1 gallon pot for one plant; or like I do, use a 18" nursery pot for many plants all at once. When the plants are in place, do not water. The damp moss is enough. Losely cover the top with a piece of clear plastic. You want a little bit of air exchange; so, don't make the top fit perfectly. Keep an eye on this and when the moss looks like it's drying out, remove the plastic and spray with a fine mist. Allow the foliage to dry for a few hours; then place the plastic back on top. It can take a few months for a plant to recover; so, don't be in a hurry. I've found this to be the best method so far, for reviving rootless plants. When they've got good roots again, gently remove them and pot as usual.