404 



BENNETTITALES 



[CH. 



FIG. 528. Gycadeoidea dacotensis. Longitudinal section through a bisporangiate 

 strobilus; s, folded microsporophylls with synangia; o, receptacle bearing 

 short megasporophylls and interseminal scales; a, eroded surface of bracts; 

 r t ramenta between the bracts and leaf-bases ; /, leaf -base ; c, cortex of stem ; 

 t, vascular cylinder of peduncle. (After Wieland; nat. size.) 



