14 
Isabel Browne. 
by parenchymatous cells; the band is roughly parallel to the 
carinal canal. This figure illustrates the fact that there is some 
variety in the way in which the lateral metaxylem groups approach 
or become linked up with the carinal group; in some cases they 
first approach one another. 
b. 
Text-Fig. 3. (a) Transverse section of the vascular bundle of the aerial 
stem of E. xylochcBtum, after Milde, x circa 100. ( b ) Transverse section of the 
vascular bundle of the aerial stem of E. debile, after Milde, x circa 460. 
The structure of the cone is now known in detail in four 
species, viz., E. arvense , L., E. palustre, L., E. limosum , L., E. 
maximum , Lam. In none of the cones of these species do the 
