The carpogonium (plural carpogonia) is the female organ in the red algae (Rhodophyta) which have a highly specialized type of reproduction. It contains the reproductive nucleus. It may contain a number of cells usually without chloroplasts. It shows an elongated process which is the receptive organ for the male gametes.[1][2]
It gives birth to the carpospores.[3][4]
It may also have hairlike structures called trichogynes which receive sperm before fertilization takes place.[5]