This is the alternation of generations- of ferns obviously.
The alternation of generations refers to the occurrence in the plant life cycle of both a multicellular diploid organism and a multicellular haploid organism. For example, ferns can be part of an alternation of generations because this plant life cycle is either or both the diploid plant or the haploid plant. The process will be from meiosis to mitosis as shown in the digram but in between, fetilization will occur or take place.
First of all, the large leafy plant is the diploid organism; these diploid have to undergo a process which is meiosis to create haploid cells, which is seen- the other plant. Therefore, these cells will not adapt quickly to form diploid cells that fast. Instead, they are shedded like spores and germinate into small haploid organisms. Since the diploid cells create spores, it is called as the sporophyte generation of their life cycle. Over some time of maturity, the haploid organism will create haploid gametes or could be called as the gametophyte generation of their life cycle. The male gametes will then be released and swim to the female egg; then it will be completed as the full or completed life cycle. 
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