16 Isabel Browne . 
quite typical of the internodal bundles of the cone. These bundles 
show considerable variations. Often the more or less transverse 
hand of xylem is in contact with a small central group of tracheides 
slightly further in. Though there is usually no definite carinal 
canal the internal tracheides are often torn, especially towards the 
base of the cone. Often there are also other little groups of small 
tracheides internal to the main transverse band of wood and 
Text-Fig. 5. ( a ) Transverse section of small vascular bundle of E. avvenst, 
just below lowest whorl of cone, x circa 245. (b) Transverse section of small 
vascular bundle of E. maximum , just above the insertion of the annulus, 
X circa 250. 
adherent to it or separated from it by a cell or two. The transverse 
band of xylem is typically one cell in depth, hut locally it may be 
two or more cells in radial extent. It is often broken by a 
parenchymatous cell or small group of such cells. A markedly 
greater development of this interruption of the main band of 
tracheides is characteristic of the cone of E. maximum. Text-Fig. 
5 b , though actually drawn from a bundle just above the level of 
the annulus, is quite characteristic of many cone-bundles. In this 
species the carinal canals, though decreasing in size, are often 
