SEED-BEARING PLANTS 



393 



curled (Fig. 286), while in the related American genus, 

 Zamia, the entire leaf is curled as well. The plants are 

 dioecious, but the two sexes so closely resemble each other 

 that they cannot be distinguished except by their sporo- 

 phylls when in fruit. 



Fig. 289. — Macrozamia Moorei, showing two lateral carpellate cones. 



362. Microsporophylls.— The microsporophylls are 

 grouped into a cone (Fig. 287). This means that they 

 are not on the main stem, for the cone is really a branch, 

 bearing only sporophylls. The microsporangia, bearing 

 microspores, occur in groups (sori), on the under surface 

 of the sporophylls (Fig. 288). 



