This is a seed grown, S. alata black tube, pubescent X S. flava rubicorpora, grown outside (hence the rather battered look), but in a pot rather than a bog. It's a very nice plant, but takes most of the season to get to its best, it isn't there yet but you can see the promise of the darker colours to come on the inside of the lid. The only trouble is as it reaches its best, so the indigestion lines start to detract from the overall look of the plant, these lines turning the pitchers first a dark green before the expected brown, you can just see the start this in the picture. I suppose if I stuffed the pitchers with cotton wool balls I could stop this, but I'm all for keeping it natural, or is that an oxymoron given what they are.
I've just realised the same thing on my alata's. There's a lot of the pitchers rotting because of so many bugs being caught and yet they are only just starting to show the deeper colouration. New pitchers are coming up in their place but I suspect they won't have enough time to colour up fully before winter cold.