But, Les Landes is not schlimii x Grande, it's Hanne Popow x Grande. So, if the Grande pollen didn't fertilize the ovary; but, the seeds produced were the result of a selfing, the seedlings would be Hanne Popow. However, an F2 generation primary hybrid will have a lot of variation. Some of the offspring will tend towards one of the background species (in this case: schlimii) and some will tend towards the other background species (in this case: besseae). The pictured flower looks just like a Hanne Popow with strong schlimii characteristics.....which is one extreme of what you should expect from a selfing of an F1 Hanne Popow. If this is the result of a Hanne Popow selfing, then, some of it's siblings will look more like besseae...and then there will be everything in between too.
One thing is for sure, neither caudatum nor longifolium is a grandparent of this flower. Have a look at Chuck Acker's Les Landes
http://www.phragweb.info/phragmipedium/hybrids/infrageneric/photos/display_infhybrid_photo_phrag.asp?photo_id=464&phrag_id=171&phrag_name=Les+Landes&photo=True&detail=False