2 6 Jackson. — Anatomical Structure of the Roots of Barley . 
of the nature of a vessel with scalariform thickening. The transverse septa 
of the cells forming the vessel are still present and appear as very thin 
parenchymatous walls. On either side of the central duct lie several rows 
Barle 1 
7? S: /?oot through point of 
emergence of lateral, (a) 
(branched type.) ( xizo ) 
Fig. 4. 
TS: Root through point of 
emergence of lateral, (b) 
( branched type.) (x no) 
Fig. 5. 
of fibrous cells with pointed ends. Among these are the vessels of the 
xylem groups, which are generally spirally thickened. Outside this group 
of cells lie the pericycle and endodermis, which appear as comparatively 
