Is any generation in the fern dependent for any length of time on the other generation?

Yes, in ferns, the life cycle includes two generations: the sporophyte and the gametophyte. The sporophyte, which is the dominant and more recognizable form, produces spores that give rise to the gametophyte. The gametophyte is typically independent but can be dependent on the sporophyte for nutrients and protection during its early development. Thus, while they are distinct generations, there can be a temporary dependency of the gametophyte on the sporophyte.