410 



BENNETTITALES 



A 



[CH. 



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- 

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

 the amaU megasporophyUs, the staminate disc with winged miorosporophylls 

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

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

 the actual size. D, thia shows on one side the dome-Uke arrangement of the 

 miorosporophylls 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 ooUeotion 

 of miorosporophylls, c; s, microsporophyll with sjmangia; A, recurved apex 

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

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



