If it's coming from you own property, great. But if it's coming from other areas I don't think it's right to take it. I know that Western WA is covered in moss, lichens and such, lived in Port Orchard for 4 years, but IMO leave it there.
I agree with this statement.
I've seen what it looks like when people "harvest" significant amounts of moss. I can't support it.
EDIT: and BTW, absolutely none of this will come from public land, sensitive ecosystems such as native forests, etc. There's plenty of it growing on private property right here in the city. And I've collected before and it grows right back the following wet season. It's very easy to establish and maintain cultivated colonies as well.
Stefan, what do you think about the idea of using CO2
Well, I've used it for years and the only visible organisms I've seen in the enclosures were springtails. And I'm not even sure they came from the moss since I also had a potted plant on the one occasion I got a springtail infestation.
I'm not opposed to it but I don't have any decorative/display enclosures yet and even then I don't think I'd use live plants. I try to keep housing and husbandry as simple as possible. Maybe down the road when I get a few tropical species...