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but for a time these remain connected. The cork formation also takes 
place between the central cylinder 1 and the accessory strands. 
The vascular supply of the normal branches consists as usual of 
branches from the central cylinder of the main shoot. In this way 
Text-fig. 1. Diagrammatic longitudinal section to show the way in which the 
accessory system gives rise to reproductive branches independently of the 
main central cylinder. The thick broken lines show the normal vascular 
tissue, the thin dotted lines the accessory bundles. 
they are directly connected with the conducting tissues of the main 
root. The accessory bundles surround the lower part of the main 
1 The term “central cylinder” is here and hereafter used to denote the 
cylinder of primary vascular bundles, and not, obviously, in the more usual 
sense of all tissues within the endodermis. 
