I have Fontinalis antipyretica ssp.
in my tank and I do like it. Willow moss is a large and beautiful moss, you can compare it to the Eleocharis next to it in this picture
. There seems to be different type of subspecies, the willow moss in aquamoss.net
looks smaller than mine. The new parts of the moss are really light coloured, but the older parts are darker. There are other Fontinalis species too, looks like there is something that looks quite like a Fontinalis sp. in a Petco located in NY, here's a thread about it:
One of my favourite mosses is stringy moss, it is really tiny and rather light green in colour, it's not as light as Riccia, but it isn't as dark as most of the other mosses either. And I really like how it grows upwards
. Fish Newb was selling it a while ago in this thread.
Here's some pictures of my mosses. From left to right: Willow moss subspecies, Riccia, SŁŖwassertang, submerged growth of stringy moss, emerged growth of stringy moss.
Willow moss, Riccia, SŁŖwassertang:
SŁŖwassertang and stringy moss submerged (the tall one) and emerged (the short bush):