PHANEROGAMIA 



and each bears two marginal macrosporangia (Fig. 449) ; only in 

 Stangeria are the macrosporangia situated on the lower surface. 



The development of the sexual generation in the Cycadaceae differs in a number 

 of respects from the general scheme for the Gymnosperms as given above. The 



Kit:. )4r>. fi/nix ri't-tilutit. ffinalf plant in Mmvrr. (Kroni ;i iilioto^fapli.) 



ditt'erences indicate that the group is more closely connected with tin- Ptelidophyta, 

 and their nature will be evident from a description of Zamia floridann , which \\u> 

 been fully investigated by Webber. 



The female cones of Zamia bear numerous sporophylls, the hexagonal shirld- 

 sliaped terminal expansions of which fit closely together. Each sporophyll licars 

 a ji.-iir of macrosporangia as is shown for (,V/Wn-.v////<V/ in Fig. 449. The macro- 



2 I 1 



