Cystocarp is a botanical term that refers to an inflated sac or structure that contains the reproductive parts of a red algae. Some synonyms for cystocarp include the terms carposporophyte, pericarp, and gonimoblast. The carposporophyte is the specific portion of the cystocarp that contains the carpospores, and the term pericarp refers to the outer layer of the structure. Finally, gonimoblast is another term that is used to describe the inner tissue layer of the cystocarp, which gives rise to the carposporophyte. Understanding these synonyms can help botanists and ecologists better communicate about the structures and functions of red algae.