The fusion of cytoplasm is known as______.

Plasmogamy is the fusion of two cells' cytoplasm without the fusion of their nuclei, resulting in the formation of a dikaryotic cell. This process is commonly observed in fungi during sexual reproduction, where two haploid cells of opposite mating types fuse their cytoplasm to form a single cell with two nuclei of different genetic information. The term "karyogamy" refers to the fusion of the nuclei of two cells and is a subsequent step in fungal sexual reproduction.