410 



BENNETTITALES 

 A 



[CH. 





D E 



FIG. 533. Cycadeoidea colossalis. Diagrammatic restorations of the bisporangiate 

 flower. A, transverse section above the receptacle showing the bracts (black), 

 a petiole with vascular bundles, ramenta, and (1 10) the wings of the micro- 

 sporophylls. B, C, longitudinal section of flower showing the receptacle with 

 the small megasporophylls, the staminate disc with winged microsporophylls 

 and synangia, and the terminal brush of interseminal scales (indicated by the 

 arrow in B). The megasporophylls and synangia are represented larger than 

 the actual size. D, this shows on one side the dome-like arrangement of the 

 microsporophylls and, on the right, a microsporophyll in side-view. E, longi- 

 tudinal section as far as the plane T surmounted by the apex of the collection 

 of microsporophylls, c; s, microsporophyll with synangia; A, recurved apex 

 of microsporophyll; B, bracts; D, insertion of disc; L, outer bracts next 

 the petiole bases. (After Wieland; ca. nat. size.) 



