Talk about the third generation of red algae

Tetrasporophyte stage. When a carpospore lodges in a suitable location, it germinates and grows into a diploid tetrasporophyte (Sporophyte II). Tetrasporangia are formed along the branches of the tetrasporophyte. Mother cells of each tetrasporangium undergoe meiosis, giving rise to four haploid tetraspores. When tetraspores germinate, they develop into male and female gametophyte, thereby completing the life cycle. In this life cycle, the three types of thalli (male gametophyte, female gametophyte and tetrasporophyte) all outwardly resemble one another.