In my experience, these can get really viney, with long rhizome "tendrils" if kept too dry, so be sure to keep a mounted specimen well-watered.
I base that on an experiment in which I dividied a potted plant, putting half in a basket of sphagnum and half in an 8" s/h pot. The basketed one get "rangey" while the one in s/h culture stayed as a dense "mound".
Thanks Ray...I'm a maniacal "mister" with the kids. I have a number of things mounted and they do get a little special care
This is just a small piece I took from the bigger plant, this is the rest of it ...