Thanks for the link on uses for Hygrolon - reading how the guy has set up his cabinet and also used Hygrolon in orchid pots - very interesting.
I just received 2 Hygrolon-covered slabs from the US supplier. One is Hygrolon over Epiweb (interesting since I've never handled either material) and the other is their half-round slab - which is Hygrolon over closed-cell foam pipe insulation.
After digging around a while, I was able to locate a small cluster of semi-loose U. campbelliana tubers. I mounted the cluster on the Hygrolon/Epiweb slab and also seeded the fabric with pieces of moss from the original slab (this seeding worked well on a tree fern slab). This is the 1st time I've tried to relocate tubers that didn't have active leaves growing - hope it works.