BENNETTITALES 



53 



ventitious, from an adventitious bud. They were about i mm. in 

 diameter, and had abundant root hairs. There were many rootlets 

 in the section, cut in various directions. In longitudinal and in 

 oblique views there were three or four rather large sclariform tra- 

 cheids. There was no satisfactory view in transverse section. 



Fig. 47. — Cycadeoidea: diagrammatic view of unexpanded strobilus. Outside the 

 sporophylls are numerous bracts densely covered with ramentum; about natural size. — 

 After WiELAND.^*" 



The strobilus. — ^The most characteristic feature of the Bennetti- 

 tales is the strobilus. The strobili were borne on the upper part of 

 the plant, usually in great numbers, hundreds having been counted 

 in several cases. They are all axillary, in some cases a strobilus being 



