PLATE XL 



FIG. 1. Protopteris 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-scar with the characteristic leaf-trace bundle. 

 P. 73. 



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

 P. 73. 



a. Tissue between leaf- bases. 



b. = Limit of Phloem. 



jo. = Portions of the stem vascular bundles passing out 



to the petioles. 

 r. = Adventitious roots. 

 .=-Sclerenchyma. 

 t. = Leaf -trace. 



