But I think I've found what I need on the Mr Nice site here: http://www.mrnice.nl/dhtml/strains.php?id=23" onclick="window.open(this.href);return false;
^ That's what I've just found. Out of about 12 seeds I have one male that looks completely different to the others. The leaves have large serrated edges, lots of fingers and the overall plant is a bright lime-green colour, whereas all the others have dark green/red/blue leaves that are spear-shaped with small serrations. I'll probably use the "G13" male to pollinate the females to see what comes out.The two distinctive features that the G13 plant brings with it are a serrated edged leaf trait and an unusually healthy (almost glossy) green in the growing plant. If you are looking to find a plant that is used to the limelight, then this is your girl!
On a related note, I've discovered the male G13 Haze clone that was used in my cross is the same as Soma's and comes from some of Neville's old G13 Haze stock from the late 80s/early 90s. Apparently Soma was given 10 x G13 Haze seeds by Ed Rosenthal that were over 10 years old and only one of them hatched and it was a male. It was used to make all of Soma's G13 collection.