 "Atractophora hypnoides" is the gametangial, that is the sexual reproductive, phase of this alga, tetransporangia are unknown.The gametangial thallus is erect, red and grows to a length of about 10 cm.In the life cycle the adult, gametangial phase of the plant, produces spermatangia in clusters and carposporophytes which produce carpospores.