Data for: Varying reproductive success under ocean warming and acidification across giant kelp (Macrocystis pyrifera) populations

(1) Counts of giant kelp (Macrocystis pyrifera) egg and sporophyte production per female gametophyte across 3 populations in California and 4 populations in Chile in a 4-week fully factorial laboratory experiment of two temperature and two pH levels; and (2) total number of male and female gametophytes observed in the same experiment.