On a walk through a park in western WA, I have found an as yet unidentified (my friend in CA has my microscope) species of Plagiomnium moss, which looks like a bunch of tiny ferns. It has been living in my moss terrarium outside for about 5 months with about 15 other rad looking species. I have seen two or three species of Plagiomnium (trichomanes and affine) in the aquarium trade but none that are common in WA. However, a search on this floral survey website revealed that about a quarter of Plagiomnium survey sites in the Olympic Peninsula are recorded as periodically flooded or inundated.
In my setup the Plagi moss favors growing on the moist glass on the back edge. I'm wondering since the moss likes to be on that back panel if it might be a flood-tolerant species that with the right lighting and CO2 can be cultivated in aquaria. So I put some in a sealed jar of water under an aquarium light.
I'll keep you guys posted, I guess. Any information about this genus of moss would be appreciated.