42 DESCRIPTION OF PLATES. 
Fig. 8. A seedling of Olax sca ndens, found in nature, attached by numerous 
haustoria to an older plant of the same species. The specimen 
is interesting in that it was through its being dug up that 
the parasitism of O/ax was first discovered. It is preserved 
in the Cambridge Botanical Museum. 
Puate II.— 
Fig. 1. Transverse section through part of the root of a young seed- 
ling (see fig. 3 of Plate I), showing the development of 
root-hairs. 
Fig. 
bo 
Part of a small rootlet of Olax found in nature (natural size and 
magnified). Numerous haustoria are being formed, and it is 
to be noted that, while the rootlet is covered with root-hairs, 
the haustoria are smooth and free from them. 
Fig. 3. Root-endings of Olax scandens found in nature (natural size and 
magnified). 
Fig. 4. A rootlet from a pot-plant attached to a pebble by a small haus: 
torium (natural size and magnified). 
Figs. 5 to 8. Haustoria of Olax scandens (figs. 6 and 7 natural size and 
5 and 8 magnified). 
In 5 note the peculiar lobing of one haustorium: this is not 
uncommon. Also note the scars left by former haustoria. 
The root attacked is that of Azima tetracantha and the 
figures are twice natural size. In 6 a series of haustoria, 
apparently terminal, are applied to a root of Albizzia Lebbek. 
A comparison with a series of specimens shows that the 
haustoria in Olax asin Santalum are never really terminal 
(see fig. 8 where a small portion of the vascular cylinder is 
all that remains of the mother root beyond the haustorium). 
Fig. 7 shows two large haustoria also apparently terminal. 
In fig. 8 a typical haustorium is shown as well as its burrow- 
ing action into the bark of the host’s root. 
Pirate III.— 
Fig. 1. A non-median section through a very young haustorium. The 
various tissues are illustrated by enlarged drawings at a, b, c’ 
and d, 
Fig. 2. An older stage of development cut so as to show the entrance of 
the bundle of vessels from the mother root. The parts are 
arranged as in fig. 1, but considerable development has taken 
place. 
