Moisture, yes is a central concern. But there are many variables in place that remain unknown. When we remove plants from nature it is important to recognize that humans tend to be poor evaluators of the host of conditions that exist on site. That is moisture but also light nutrients, air circulation, day/night temperature variation ect. Generally the tropics mosses such as the dusk mix are more adaptable and culture to be prolific in cultivation. Tropicals in general are more accustom to what we can offer in cultivation. Apart from that I do thing the setup you’re proposing will degrade quickly and is liable to release compounds harmful/inhibitory to growth.
I think all of us want you to succeed. I have started cultivating bryophytes exclusive terrariums, they are wonderful, but as non vascular plant, they need constant moisture to be vigorous enough to cover a surface. Depending on how large what your looking to construct is, you may also look into wabisabi culture and kits. Materials of interest include terracotta and rock wool. Also worth looking at is dendroboard… but I must emphasize that all even under glass moss is a difficult proposition for most to get full coverage on. Out side of that bonsai growers spend years getting moss to grow on the surface of their substrates that they tend to water daily.
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