Fig. 9- — A spore-bearing leaf {megasporo- 

 phyll) from a female cycad {Cycas revoluta), 

 bearing six young spore cases {ovules) con- 

 taining "large" spores \tne gas pores) . 



The spores have developed, within the spore 

 cases, into the egg-bearing phase of the plant 

 \gametophyte) . The spore-bearing phase of the 

 next generation begins its development within 

 the tissues of the egg-bearing phase, thus forming 

 the embryo, which resumes its growth when the 

 seed germinates. The "small" spores {micro- 

 spores') are borne in microsporophylls on male 

 plants. 



Reproduced, by permission, from Gager's Funda- 

 mentals of Botany, published by P. Blakiston's 

 Sons and Co. 



