ANATOMY OF ENHALUS ACOROIDES. 357 
The cortex is traversed by vaseular bundles from the leaves and roots, those from the 
former, becoming devoid of bast-fibres, descend obliquely and enter the central cylinder 
(Pl. 36. fig. 1). 
The endodermis is a thin-walled layer of irregular-sized cells, which show the typical 
cuticular band (Pl. 36. fig. 3, e) and do not contain starch. They thus present a marked 
contrast to the parenchyma-cells without, and the pericycle within, the former con- 
taining large and the latter small starch-grains in great numbers. The stele within has 
the form of a fluted cylinder, so that the endodermis in transverse section presents a 
sinuous contour. 
Fig. 1. Fig. 2. 
- spur - 
c ba- :-- ud 
x 
S 
~~ : - 
Ro + 
*. c 
~ ow 
e-fifth of the diameter of the stem. The vascular 
er ring of vascular bundles. 
at irregular intervals by the 
d the central bundles there 
but most of these are 
The stele (Pl. 36. fig. 1) occupies on 
system consists of a solid central core of bundles and an out 
The pericycle consists of a single layer of cells interrupted 
onter ring of vascular bundles. Between the outer ring 5n 
s à band of parenchyma and pigment-cells of various sizes, 
elongated in the direction of the stem-axis. 
The central bundles are derived from the midrib and marginal bundles of the wm 
pa marily. As the leaves are arranged distichously and are median dorsal and ven 
i T in from the 
in Insertio nal and one midrib bundle, come im 
| n, three bundles, two margina Eus lia thé veut iii 
dorsal side at a time (text-fig, 1, x, v, 2), and then a similar t me 
