I agree with KoG, it is more than likely riccia. There is strikingly similar tank in Nature Aquarium World Vol.1 (the same one?), that according to Amano's lists, is Riccia. Also, there is what appears to be Dwarf Sag or a similar dwarf, running sword mixed in the carpet as well (the somewhat larger leaf like plants mixed in, particularly noticable in the back left corner).
If you're really interested in this style of tanks, check out the Nature World Aquarium series. They are written and photographed by Mr. Amano and include lists of the plants used in each tank, as well as the specific lighting and CO2 used. I have all three and love em, though the translation into english could use a bit of improvement and there are a few scientific names used for fish which are entirely outdated.