Which plant group is notable for the independence of gametophyte and sporophyte generations from each other?

Ferns

Explanation:

Ferns are a group of vascular plants that do not possess flowers and seed, but generally reproduce through spores. The differ from other vascular seed plants because they do not have seed and flowers but reproduce through spores. Unlike other vascular seed plants that the gametophyte develop within the wall of the spore and depends on the sporophyte, the gametophyte of fern are free living and independent from the sporophyte.

The gametophyte of the fern consists of rhizoids and prothallus.