Abstract: The cell of Caloglossa leprieurli is a polycaryon. The sexual thalli are usually dioecious. Its life cycle involves the alternation of three generations. In the reproductive season, the appearance of tetrasporophyte and female and male gametophyte shows evident difference. The tetrasporophyte is big and flat. The branches are sparse. Many small red spots, i.e. tetrasporogial groups, can be seen with the naked eyes in the upper part of the branch. The terminal part of the female gametophyte is a little twisted with thick branches. The cystocarps are spherical and most of them are located in ventral side of the upper branch points. The male gametophyte is smaller with less branches. Its terminal part is a little twisted with pale colour. The pit connections of the vegetative cells of every thallus are all well developed. The carpogonial branch consists of four cells. Generally, it is formed by the division of the pericentral cell. After fertilization of the carpogonium, an auxiliary cell is formed by the division of supporting cell. Usually five to seven, even more than ten young procarps can be formed at the apical part of the reproductive branch. The procarps often occur on consecutive segments of pericentral ceils. But among most of them only a carpogonium is fertilized and developes into cystocarp. When a carpogonium is fertilized, the other one on this branch usually cease further development. The spermatangia are formed on the lateral wing cells of both sides of the upper part midrib of a reproductive branch and distributed on both dorsal and ventral surfaces. A vegetative cell is divided into three cells in parallel to the surface of the thallus. The cortical cells under the two outer surfaces forms three to four permatangial mother cells. Each spermatangial mother cell divides into two to four spermatangia. After the sperm dispersal of the mature spermatangia, the spermatangial mother cells are still retained on both sides of the middle discoid cells.

Key words: Caloglossa leprieurii, Carpogonium, Carpogonial branch, Supporting cell, Auxiliary cell, Procarp