NOTE. 
ON THE DISTRIBUTION OF CHLOROPHYLL IN THE YOUNG SHOOTS 
OF WOODY PLANTS. — In the young shoots of many trees and shrubs, the chloro- 
phyll appears to be present not only in the cortex, 
but also in the cells of the medullary rays and in 
some of the cells of the medulla. This is par- 
ticularly well seen in Jasminum nudiflorum , Lindb, 
which flowers in February and March, before the 
leaves appear. As might be expected, the axis of 
the inflorescence in this plant possesses the char- 
acteristic features of a typical assimilating axis. 
Xerophily is well marked by the deeply sunk 
stomata and the much cutinized epidermis. The 
surface is increased by small lateral extensions of 
Fig. 2. Tangential section through 
phloem, showing chlorophyll in medullary 
rays. 
two opposite sides of the square axis ; the extended 
sides alternating in consecutive internodes. The 
palisade tissue is developed beneath a single colour- 
less hypodermal layer. 
The chlorophyll is found not only in the 
cells of the palisade layer, but in many or all 
of the cortical cells, in the pericyclic parenchyma 
bordering on the sieve tubes, in the medullary rays 
running through the phloem and xylem, and even 
in some of the medullary cells. The medullary 
cells that contain chlorophyll border on the pro- 
toxylem. They are thicker-walled and slightly smaller than the more internal 
medullary cells, and are pitted and give the reaction for lignin with acidulated 
phloroglucin. 
Fig. i. Transverse section through 
inflorescence axis of Jasi?iinu}n nudi- 
flonmi, showing distribution of chlor- 
ophyll. 
