The March 2013 issue of Annals of Botany is now Free Access. The cover image is of two generations of moss, the younger sporophytes growing from the parent gametophyte. AJ Cann blogged about this paper last year.
If you get confused between sporophytes and gametophytes, then you’re not alone. Plants alternate generations between sporophytes and gametophytes. The children of oak trees aren’t acorns, they’re grandchildren. The ‘children’ of oaks would be pollen and the embryo sacs they pollinate. Contrary to popular belief pollen isn’t plant sperm.