PLATE XI. 



Fig. 1. Protopteria Witteana, Schenk. Portion of a stem axis showing 

 leaf-bases and adventitious roots, etc. Page 73, 



Probably Mantell Coll. 



Fig. 2. The upper surface of Fig. 1 showing the form and arrangement 

 of the vascular bundles. P. 73. 



Fig. 3. A single leaf-soar with the characteristic leaf-trace bundle. 

 P. 73. 



Fig. 4. Small piece of a stem vascular bundle. Magnified 45 times. 

 P. 73. 



' as. = Tissue between leaf- bases. 

 h. = Limit of Phloem. 

 p. = Portions of the stem vascular bundles passing out 



to the petioles. 

 r.= Adventitious roots, 

 s. =Sclerenchyma. 

 <. = Leaf-trace. 



