Feb. 1. 1925 
Vegetative Organs of Sugar Cane 
219 
itself as in the surrounding paren¬ 
chyma. The cells of this tissue, at a 
time when the large vessels are just 
differentiating, are about 65m in width. 
When the bundles are fully developed, 
the parenchyma cells measure 125m 
and may attain even greater dimen¬ 
sions. This increase in size of the 
Kobus (10). It takes place in the same 
sequence as in the stem, only it seems 
to be more rapid. Thus an inter node 
which bears a leaf sheath 3 to 4 cm. 
long has only a few mature protoxylem 
elements, while in the leaf sheath the 
large vessels are already fully de¬ 
veloped, although not as yet lignified. 
parenchyma cells is in a large measure 
responsible for the enlargement of the 
stem, since the maximum number of 
bundles present in a stem is reached 
long before the latter has attained its 
final thickness. 
The differentiation of the tissues of 
the leaf sheath has been described by 
The phloem of the leaf sheath also 
develops in advance of that in the 
stem, since differentiation into sieve 
tubes and companion cells has already 
taken place. 
■ The epidermis of the young stem and 
of the lateral organs is made up of thin- 
walled rectangular cells (pi. 11, B). 
