124: A TEXT-BOOK OF BOTANY 



small, pore-like opening (Fig. 114). On the walls of these 

 cavities oogonia and antheridia are produced. The oogo- 

 nium is peculiar in that it usually produces eight eggs, 

 which are discharged and float free in the water (Fig. 115, 

 A and E). About these eggs the sperms swim in great 

 numbers, often striking against them and setting them 

 rotating (Fig. 115, F and H). Finally, a single sperm fuses 

 with an egg and an oospore is formed, which later produces 

 a new Fucus plant. 



This group of brown Alga3, therefore, differs from the 

 other one in producing no swimming spores, and in its 

 dissimilar gametes (eggs and sperms). 





 4. RED ALG.E (Rhodophycece) . 



74. General characters. The red Algae are mostly 

 marine forms, and receive their name from the fact that 



FIG. 116. One of the red Algae. 



a red coloring matter completely masks the chlorophyll. 

 As a consequence, the plants are various shades of red, 



