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Seedling Anatomy of Certain Sympetalae . II. 
merges into one of the xylem-masses as described above. In the xylem- 
strands situated in the cotyledonary plane, the protoxylem becomes exarch, 
the phloem-groups unite laterally in pairs, and a diarch root-structure results 
(Diagram 2, v). 
Seedling C is slightly different from the above. Before the first fusion 
of the cotyledons along one side, each of the laterals on that side fuse with 
the corresponding midrib, making the whole structure asymmetrical. At 
Diagram 3. Charieis heterophylla. (For I see Diagram 2 , 1.) 
a lower level, new bundles appear on the same side of the two midribs, fuse 
together as soon as the cotyledons on that side unite, and immediately dis- 
appear without ever having been connected with any of the other vascular 
strands. The behaviour of the remaining vascular bundles is exactly as in 
Seedlings A and B. 
