Much as I enjoy reading James Purchase and Loh Kwek Leong, that article wasn't very illuminating.
LKL says, "One way to differentiate Christmas from Java would be to look for spores. I'm not sure if that is what they are called but I'm referring to the little brown stalks with something like a bud at the end of it. It looks like a comma. Christmas moss will usually have some such spores but I have never seen them on Java. Christmas moss grown emmersed will produce many spores."
Which would make virtually ALL moss I've ever seen here in southern Ontario Christmas moss, since I've rarely seen any without spores, and any I got without spores produced spores readily.
James says "Since mosses only develop these structures when grown emersed, folks with mosses growing entirely submerged may never see them." Er... if I had a camera I would be happy to show all the 3 submerged clumps in one tank which repeatedly sprout the structures entirely submerged. They've never been emersed since I got them.
I'm not kidding when I say one of my clumps of long, straggly threads, which James describes as Java moss, originated as one single piece which was identical to the Christmas tree shaped piece in the first photo -- triangular growth of tightly spaced branches.
I have not yet seen a visual method of identifying Java moss versus Christmas moss which doesn't run afoul of what I see in my own tanks, because the moss morphs into very different growth patterns depending on where I put it.
I'm quite interested in hearing from anyone who can verify that these are different species, what the scientific name of Christmas moss would be, and a surefire way of identifying it.
Until then, I call it all Java moss.
