{ 
* 
364 ~~ Structural and Phystological Botany. CN 
groups :—prosenchyma, parenchyma, and _ vessels. The 
prosenchymatous cells of the xylem—which are also called 
’ 
=<S 
eo SASs —_ — 
2g ——"¥ 
Wy = if i) 
‘a 
Pit ) 
U 
j 
d 
Fic. 474.—langential section through the wood of the maple; G vessels ; H/ wood- 
bres ; s ‘silver-grain’ (x 200). 
e 
qwood-cells, wood-fibres, simple bast-like wood-fibres, of 
libriform fibres—are always fusiform, comparatively strongly = 
thickened and lignified, unbranched, and, asarule, furnished 
