44 
DESCRIPTION OF PLATES, 
A unique specimen of a haustorium immediately before penetration. 
The vascular loop is well developed and a number of vessels 
are formed. The median shadow c in the upper part of the 
nucleus is the first stage of the vascular strand of the axis. 
By the growth of this part the cap is being thrust down into 
the lumen, the tissues there being completely disorganized. 
When the cap is pushed down, a part of the nucleus, 3, is left 
behind on each side. This portion is separated from the region 
of the cap by a bay of clear cells, d. 
clear zone of the cortex, cl., is devoid of all contents and its 
cellsare moribund. The first traces of the collapsed layers ce, /., 
are observable at the junctions of the clear and starch-filled 
cells of the cortex. The root attacked is one of Zizyphus 
Oenoplia and a small crack is seen in the bark, just opposite 
to the opening of the duct of the gland. 
In fig. 3 a small portion of the cortex is figured lower down, where 
Pirate VI.— 
The 
PLate VIl.— 
Fig 
Fig 
Fig. 
Fig 
clear and starchy cells adjoin one another and the collapsed 
layer is about to be formed, at first from the crushed cells of 
the clear zone and, later, from the inner cells of the starch-filled 
zone, the cells having meantime lost their contents. 
. 1, A transverse section through an Olaa haustorium penetrat- 
ing a root of Asparagus racemosus. The sucker is tongue-like 
and has reached the woody cylinder of the host, «. Note /ac, 
lacuna, g/, traces of a former gland. 
. 2. A part of the gland trace from another section through 
the same haustorium. z, woody cylinderof thehost’sroot. A 
portion of the lumen remains and it is bounded by the 
mucilaginous secretion poured out by the cells. The indistinct 
lines show successive layers of this secretion. 
3. The end of the lobe of a haustorium which has wandered 
in the cortex of a root of Casuarina equisetifolia and has not 
succeeded in reaching the wood of the host. The sucker cells 
are moribund and, as in all such cases in Casuarina, form a 
very pronounced palisade tissue. They are embedded in brown 
substance largely produced from sucker cells when in a state of 
activity. 
. 4. The edge of a haustorium, the central part of which has 
succeeded in penetrating a root of Vitea Negundo as far as the 
cambium. It is presumed that the figure represents in some 
