BENNETTITEAE 



563 



by Count Solms-Laubach in an Italian species, and by 

 Dr. Wieland in the American material) agree precisely 

 with the corresponding structures in a recent Cycad. ■ 

 It is only when we come to the course of the bundles 

 passing out to the leaves, that important differences 



Fig. 201. — Bennettites Saxbyamts. — Transverse section of stem, fi, pith ; x, wood,///., 

 phloem, together constituting a ring of collateral bundles ; l.t., leaf-trace bundles, pass- 

 ing out through the cortex, and subdividing repeatedly ; /./<., bases of leaves, which 

 clothe the stem. Reduced. From the Linnean Soc. Trans. After Carruthers. 



show themselves. In recent Cycads, as is well known 

 to the botanical student, the course of the leaf-traces is 

 peculiar and characteristic. To supply each leaf, two 

 bundles leave the stele ; they start near together, and, 

 curving in opposite directions, pass nearly half way 

 round the stem, thus entering the leaf-base on the 

 opposite side from their starting-points. They then 



37 



