DESCRIPTION OF THE PLATES. 
» 
Figures 1 to 13 and 25 to 28 are from fresh material and are photo- 
graphs by Cortes. Wherever a scale is shown it is divided into cm. 
Figures 14 to 22 are microphotographs by Martin and 23, 24 by Cortes. 
Plate XII. 
Fig. 1. Male flower of Rafflesia manillana Teschem. 
2. Female flower of Rafflesia manillana Teschem. The differences in 
the shape of the flowers shown in figures 1 and 2 are individual 
variations and are not characteristic of the sexes. 
Plate XIII. 
Fig. 3. Longitudinal section through female flower and root of host. The 
base of the flower is in contact with a vase-shaped mass of 
xylem formed by the host. The bark of the host extends around 
the base of the flower from the xylem half way to the corolla. 
The cambium between the wood and bark of the host shows 
plainly as a dark line* The ovarial cavity of Rafflesia is shown 
in the white spongy tissue in the center of the base. 
4. Section of unopened male bud of Rafflesia manillana. The root of 
the host is shown in cross section. The bark of the host extends 
around the base of the flower and ends just under the bracts. 
Two pollen sacs are seen under the disk which terminates the 
central column. 
Plate XIV. 
Fig. 5. A root of Cissus with two small swellings caused by Rafflesia 
manillana. 
6. A bud of Rafflesia manillana breaking through the bark of Ciasua. 
7. A slightly older bud of Rafflesia manillana. 
8. A root of Cissus with a bud of Rafflesia manillana which has, and 
two which have not, broken through the bark. 
Plate XV. 
Fig, 9, A root of Cissus with a half grown bud of Rafflesia manillana and 
two swellings. 
10. Bud of Rafflesia manillana about ready to open. 
11. Cross section of root of Cissus containing a bud of Rafflesia 
manillana. X !•& 
12. Older stage than figure eleven. X 1-5 
13. Older stage than figure twelve. Xl.5 
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