Also, from what I have seen these materials work very well, both Epiweb and Hygrolon, for growing many plants, primarily epiphytes and mosses. But they both, specifically Epiweb, have a tendancy to dry out, so with them a good misting system is essential. Dusk Tropic has also come up with a product that is pre-seeded to grow moss,( http://www.epiweb.se/epiwebiis3.htm more details on the middle of this page) a handy thing to have.

Sorry for the double post