2 10Ne 
STUDIES IN ROOT-PARASITISM. LIBRAR) 
NEW YOR 
By C. A. BARBER, ™.a., F.L.#., BOTANICAL 
GARDEN. 
Government Botanist, Madras. 
THE HAUSTORIUM OF OLAX SCANDENS. 
In previous papers of this series the Haustorium of Santa- 
lum album was described in considerable detail.’ It was at the 
same time noted that certain Olacacew had been found to be 
green root-parasites in much the same manner as the sandal. 
Collections have been made in South India of haustoria of 
Cansjera Rheedu, Olax scandens, Ximenia americana and Opilia 
amentacea. The present paper deals with the parasitism of 
Olax scandens, this plant having been selected because of 
important differences between its haustorium and that of Santa- 
lum album. These differences are less marked in the mature 
haustorium, and lie chiefly in the manner of development of the 
various tissues, the limits of nucleus and cortex, the formation 
and structure of the gland, the number of cortical folds, the 
composition and place of origin of the collapsed layers and the 
arrangement of the vascular system. In most of these charac- 
ters the haustorium of Olax scandens appears to differ from 
those of the other haustoria named above as well as from those 
of Osyris and Thesiwm and, in describing it, these characters will 
be dealt with much more fully than those in which there is 
agreement with the haustorium of Santalum album. 
A careful perusal of the literature on root-parasites reveals 
oo the fact that suggestions have been offered in the past as to the 
' Studies in Root-parasitism.—The Haustorium of Santalum album. Part I,—Early 
stages, up to Penetration. Part II.—The mature Haustorium. Memoirs Dept. Agri. 
India, Botanical Series, Vol. I, No. 1, Parts [ and II—1906-07. 
