In which plant taxon does the sporophyte remain dependent on the gametophyte for a short period during its growth?

I am having a difficult time understanding which plant taxons have reduced gametophyte dependence. My professor made the image below but I don't understand how a moss's gametophyte would be more independent (since the sporophyte stays attached to the gametophyte) than the seed plant.

You will find the answer on Plant Classification.




Reduced gametophyte independence



Mosses Ferns Seed Plants
--+-------------------------+----------------------------+------------------>


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