Only one of the m.ae.rospores uevmupB 

 which remains enclosed in the sporangium 



SPERMATOPHYTES 305 



develops into a Gametophyte, 

 Taiiffium. Several archegonia 



Several archegonia 



Fig. 151. — Cycas revoluta. 



which are somewhat simpler than those of the Pteridophytes are 

 developed at the micropolar end. The microspores (or pollen 

 20 



