PTBRID0PH7TA. 



233 



434. The sexual plant of the Little Club-mosses is 

 almost obliterated. When a small spore germinates, it 



Ftg. 139.—^, part of branch of a Little Club-moss (Selaginella msequi- 

 folia), bearing a cone. Natural size. B, enlarged vertical section of a 

 cone, showing spore-cases, with large and small spores. 



becomes divided internally into a considerable number of 

 cells, one of which is the remnant of the sexual stage (pro- 

 thallium), while the remainder form one large antherid, 

 each cell of which produces an antherozoid. 



