Winging it

Out for a wander yesterday I noticed this winged bark on several, but not all, stems of a young tree. Not sure if it's just the normal variant that I know can be found in some species, or whether there is another cause. Basically I'm hopeless with trees, but once the leaves are open maybe I'll be able to identify the tree and find out. Intriguing though.

In the meantime if you know please tell me!