Here's a breakdown:

* Spores: Produced by the sporophyte (the dominant generation in ferns) and released.

* Gametophyte: A small, heart-shaped structure that develops from the germinating spore. It is haploid (containing half the number of chromosomes) and produces both male and female gametes (sperm and egg).

* Fertilization: Sperm fertilizes the egg, forming a diploid zygote.

* Sporophyte: The zygote develops into a sporophyte, the dominant generation in ferns, which produces spores and completes the cycle.