That's the thing!! I can't get it too!
I was doing exactly what you all are saying, it was covered all over with sphagnum and i watered it every day. All of my other orchids thrive in the florarium they can't stop growing. But with this plant it may have been another problem coz at first it started 4 new roots and then dried the ends of them and soon the whole roots as well even though i wasn't doing anything any other way. I guess it may have been too much water so i removed the moss hoping that it would like it but instead it went all the way dry as the Sahara. Now i don't spray it only keep humidity on 70% that's the best i can get. Maybe a little more light?... I could place it higher in the florarium. Btw when i bought it and got it out of the pot the roots were just like this, no use for anything.. I hope next time i won't have to fight so hard for a plant coz i think at the moment it opens its first bud i'm gonna fall completely in love with it. Sooooo i'm giving it a bit more light spraying every day and placing it closer to the light, maybe it will be enough. Cross your fingers for me!