Hybridization of Vitis Rotundifolia 
11 
another single vine. In these cases the bundles were not adjacent hut 
came from different parts of the same transverse section. The pair in 
Figures 39 and 40 show well, not only the tendency to form alternate 
layers of hard and soft hast, but also (Fig. 40) the squaring up of the 
bundle due to the intervascular ray not widening out by cell multipli¬ 
cation. Figure 43 shows the varying amount of phellogen in the same 
stem. Figure 42 is of interest because of the small amount of hard 
bast fibers present. 
VARIETY WINCH ELL 
(Hybrid of Y. labrusca, Y. aestivalis, Y. vinifera) 
While it has not been possible, as yet, to pick out distinctive specific 
characters of the stem on the basis on which this study is made for the 
different species of Yitis, the anatomical characters of Winchell resem¬ 
ble most closely of the three parents, those of V. aestivalis, and the dif- 
feiences noted m the following description vary from the F. vinifera 
species in that direction. 
Baric. The bark is reddish-brown in color, striated and shedding in 
long fibrous plates. 
IT ood. The wood is soft and brittle and quite porous. It is light 
in weight and almost round in cross-section. 
1 ith. The pith column is very large m diameter and larger in pro¬ 
portion to the diameter of the stem than V. vinifera (Fig. 46). In this, 
it resembles the V. labrusca parent. The pith is dry and loose, light- 
brown in color, and composed of large, thin-walled cells. There is a 
thick diaphragm at the node composed of compact lignified pith cells 
with thick walls having simple pits. 
Xylem. The xylem of this variety is quite like that of V. vinifera, 
but the bundle is not as deep m proportion to the stem diameter on 
account of the large pith. The cells are a little smaller and not as 
thick walled. (Fig. 46.) 
Phloem. The phloem is in the typical arrangement for Euvitis 
species. The cells are more uniform in size and smaller than V. vini¬ 
fera. The fibers of the sclerenchyma bundle differ very little from 
those of V. vinifera (Fig. 47). 
Cortex. The cortex in this species differs but little from that of V. 
vinifera as above described. 
V. VAR. WINCHELL X V. ROTUNDIFOLIA HYBRIDS 
Bark. Most of the hybrids of this cross have a rather smooth, red¬ 
dish-brown bark, darker in color than the V. vinifera hybrids. On 
these the bark sheds either in long fibrous plates or in smaller flakes. 
Others of the cross have a persistent bark which is lighter in color 
and more of a greyish-brown, with many lenticels. 
