416 



B ENNETTIT ALE S 



[CH. 



fertile shoots are preserved: a single axillary bud is described 

 which agrees very closely with that in Cycadeoidea gigantea. 



Cycadeoidea Jenneyana Ward. 



The stems of this species, from the Black Hills of Dakota 1 , 

 resemble those of Cycadeoidea gigantea and C. Reichenbachiana 



FIG. 539. Cycadeoidea Jenneyana (? ). Longitudinal section of an ovulate strobilus, 

 showing the pyriform receptacle with vascular supply, the long interseminal 

 scales and megasporophylls, and a few of the surrounding bracts. (After 

 Wieland; x 1 nat. size.) 



in their thick columnar form but differ from the former in the 

 presence of bisporangiate flowers associated with the leaf-bases. 

 This species probably reached a length of 3 4 met. A striking 

 feature 2 is the unusual thickness of the xylem-cylinder, which 



Ward (94) p. 87; (98) p. 216. 



2 Wieland (06) p. 79, PL xiv. 



