Thanks for the pics. It's all an experiment, right? So I redid some of my mounts and I learned two things:
1. They were drying out really fast, within a day, and while the roots seemed ok I'm not sure it was a long term solution.
2. The mounts I did previously that already had more moss that was held in place well (snug but not tight) were healthier looking, even though they were different plants, I take this as a sign that a slight bigger moss mound for these mounts is likely a better option.
I'll keep an eye on things for sure....I don't mind dismantling a mount to check on the health of plants.
I redid my larger Bellina today and the roots looked good. So I didn't add more more but used netting to secure the moss instead of simple fishing line.
Also, these planks are untreated and have a bunch of holes drilled into them per the earlier suggestion to do so.
My smaller Bellina I should mention has been in a moss mount now for a few weeks and it threw a new leaf. The leaf seems very healthy. Now I'm looking for new roots! I see little nubs suggesting they're on their way.