FLOR1DE.E. 



81 



1867) differs in the essential points from that of all other 

 plants, and approaches most nearly to the sexual reproduction 

 of the Bang-widen;. The sexual cells are developed from the 

 terminal cells (never nodal cells) of the branched cell-filaments, 

 which constitute the thallus. The mother-cells of the spermatia 

 (spermatangia) are generally arranged in a group, in the so-called 

 antlieri'Hci (Figs. 74, 77 A, a). On becoming ripe the membrane 

 of the spermatangium ruptures and the spermatia emerge as 

 spherical or ovoid, naked (a little later they may possess a cell- 

 wall) masses of protoplasm which are not endowed with the power 

 of motion, and hence are carried passively by the current of the 



FIG. 77. A Lejolisia mediterranea : rhaptera; s longitudinal section through a cystocarp ; 

 p the empty space left by the liberated spore (0- -B-.E Nemalion multifidum: a antheridia ; 

 b procaruium with trichogyne, to which two spermutia are adhering. 



water in which they may happen to be, to the female cell. This 

 latter is analogous with the oogonium of the Green Algre. The 

 female reproductive organ is termed the procarpium, and consists 

 of two parts, a lower swollen portion the carpogonium (Fig. 77 b 

 in A and B) Avhich contains the cell-nucleus, and an upper 

 filamentous prolongation the trichogyne (Fig. 77 B) which is 

 homologous with the colourless receptive spot of the oosphere of 

 the Green Algre, and the Porphyracece. In the sexual reproduc- 

 tion of the majority of the Floridea?, a very important part is 

 played by certain special cells, rich in cell-contents the auxiliary 

 u. B. G 



