Cone and Fertile Stem of Equisetum . 263 
Fig. 5. Transverse section of a vascular strand of one of the internodes of the middle part of 
a cone of E. giganteum. Note radial depth of xylem. x 50. 
Fig. 6. Transverse section of the internodal axis in the upper part of the cone of E. giganteum. 
Note relatively large amount of xylem. x 45. 
Fig. 8. Transverse section of a node of the cone of E. giganteum . Note the comparatively 
large size of the traces and the absence of a definite central cavity. x 40. 
Fig. 10. Transverse section of the axial stele of E. hyemale , a little way above the insertion of 
the annulus. Note that a large proportion of the separate bundles of the internode have fused, x 40. 
PLATE IX. 
Fig. 11. Transverse section of a node of the cone of E. hyemale . As the sporangiophores 
are not all inserted at exactly the same level not all the bundles are giving off traces, x 40. 
Fig. 12. Transverse section of the internode of the cone in E. hyemale. x 55. 
