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No matter which forum I look at,there is always confusion regarding the potential of different mosses to grow underwater. Looking around creeks and other waterways,we have all come across mosses growing in damp areas or spots that are underwater at times through the year.It is tempting and even worthwhile to take samples to see if they will grow submerse.The potential is that you may discover the "next" big moss and the crazy thing is that you may even walk over it every day on the street. So here are some facts. In Australia,there are NO obligate aquatic mosses.This simply means that all our mosses can grow out of water.Same goes for most of the mosses we treat as aquatic,but some definitely grow more easily than others. Here is a fact that should get a few people into the car with buckets,nets and bags.....On the East Coast of Australia,at least 10.....yes ten.....species of Fissidens have been identified by scientists,mostly in rainforests. If you have been bushwalking near creeks,you will have seen mosses and ferns growing in the splash area of waterfalls,or in shallow ,fast moving water,attached to rocks etc.These spots are high in Oxygen and CO2.You will probably find more mosses in cool streams rather than those exposed to full sun,[ and thus warmer water]. If you are trying to acclimatise a potential moss species to underwater growth,it makes sense to mount or place the moss near the outlet of a filter.This will help replicate the natural splash area.Remember also,mosses prefer cool water. If you are looking for moss around your house,take an atomiser and spray any dry clumps with water.They will often respond within 30 seconds as their cells fill with water.Mosses that respond quickly have a better chance of working for you than the others. I hope this will encourage you to seek out all the damp spots where you live....good luck.