As far as my searching tells me...Plagiomnium Trichomanes is a bryopphyte with some (alleged) medicinal properties. It is harvested (in China or distributed from there) and it (or its extracts) are offered for sale world wide. I can find no specifics on exactly where it grows or its natural habitat. It has been quite frustrating, really. I plug in a word like Holotype and google says "Huh?".
The few reliable looking references generally wast to talk about the biochemistry and/or genetics of the plant and any background information is beyond reach as I'm not willing to subscribe ($$$), so all I can see are the abstracts.
I don't have the feeling that this particular species grows in North America though...
