Gah, I bought mislabelled Xmas moss from Ebay... last year? I believe. Arrived riddled with BBA and I had to scrap most of it. Stinking stuff was meant to create neat little topiary creations, instead grew up into the air despite filter current... I was very sad at the time. Lol.
I asked about it on the Aquatic Plant Central forum, best anyone could figure was a type of erect java moss. Not squiggly enough to be flame moss, imo. I call it my mystery moss, and it's doing great now that it's been left to grow upwards as intended, sitting attractively at the bottom of our aquarium. I no longer regret it's purchase!
Only thing I don't like about that auction is no description of how much you're getting - the whole clump in the photo? Doubtful, since it was a "5 available" listing. I'd ask about that before you buy.