ap 



127 



FIG. 15 



A Megasporophyll of Cycas, with six megasporangia, or 

 ovules, o. 



B Two microsporangial cones of a spruce. 



C Two views of a sporophyll showing the two sporangia, 

 or pollen- sacs, sp, upon its lower face. 



D Two cones of a club-moss, Lycopodium, showing a 

 marked superficial resemblance to the cones of the spruce. 

 The sporophyll, E, has a single sporangium upon its upper 

 side. 



several vegetative cells and an antheridial cell. The 

 germinating spore sends out its pollen-tube, which 



