206 



BOTANY. 



not strictly correct then to say that the stamen is a sexual organ, 

 or male organ, we might regard it as a male member of the flower, 

 and we should distinguish between organ and member. It is an 

 organ when we consider pollen production, but it is not a sexual 

 organ. When we consider fertilization it is not a sexual organ, 

 but a male member of the flower which bears the small spore. 

 The following table will serve to indicate these relations. 



Stamen = spore-bearing leaf = male member of flower. 



Anther locule = sporangium. 



Pollen grain = small spore = reduced male prothallium and 

 sexual organ. 



So the pistil is not a sexual organ, but might be regarded as 

 the female member of the flower. 



Pistil = spore-bearing leaf = female member of flower. 



Ovule = sporangium. 



Embryo sac = large spore = female prothallium containing the 



egg- 



The egg = a reduced archegonium = the female sexual 

 organ. 



A C 



Fig. 185. 



A, represents a straight (orthotropus) ovule of polygonum; B, the inverted (anatropous) 

 ovule of the lily ; and C, the right angled (campylotropus) ovule of the bean. /, funicle ; 

 c, chalaza ; /t, nucellus ; at, outer integument ; />', inner integument ; ;, micropyle ; em, 

 embryo sac. 



339, Parts of the ovule. In fig. 185 are represented three 

 d.ffertnt kinds of ovules, which depend on the position of the 



