zenkatydid
Aquarium Advice FINatic
Don't know if this page is known already, but I just found it and it's a fantastic resource for recognising different mosses. Also on this site are some STUNNING pictures of mosses used over wood, as a ground cover, and in a moss wall.
http://www.killies.com/Truthaboutmosses.htm
http://www.killies.com/Truthaboutmosses.htm