which is connected with the bark by more or Tags latgely’ 
hae 
ard 
. A 
Fs 
on tructural a Ph Iysiolagical Botany. an 
‘developed portions of cellular tissue, the medullary rays, 
greater number of roots the 
tal tissue is altogether absent, 
cortex. 
Fic. 95.—I. Diagrammatic representation of the distribution of the Aerovasenten | 
bundles on the transverse section of a palm-stem. II. Portion of the transverse 
section through a shoot of ivy four years old; R bark; B bast- bundles ; 
H wood, in which the four annual rings are distinctly visible ; mM pith ; s? medul- 
lary rays; F bast-fibres; c 6 cambium; s** primary ; s‘** secondary bundles. 
The various elements, the different forms of cells, tissues, and fibro- 7. 
vascular bundles, are always arranged in each species ina thoroughly : 
characteristic manner ; and from this, as well as from the nature ot, the = Fy 
fos 
(Fig. os, IL, 5. in by far the | 3 
fibrovascular bundles, on the 
contrary, form a cylinder des- — 
titute of pith and reaching the 
centre, so that the fundamen-. 
or, according to other au- 
thorities, is developed only as. _ 
er 
