40 THE JOURNAL OF INDIAN BOTANY. 



sclerenchymatous pericycle. The pericycle consist of large groups of 

 stone-cells separated by the chlorophyll containing parenchyma of the 

 cortex. The wood (fig. 2) is composed of large xylem bundles separat- 

 ed by broad medullary rays which come into contact with the chloro- 

 phyll containing parenchyma of the cortex. Vessels are large and 

 have simple perforations. Groups of cells, resembling bast fibres, are 

 present on the inner side of the xylem. Inter fascicular wood-prosen- 

 chyma is not developed. The endodermis is not differentiated. The 

 soft bast occurs in groups on the outer side of the xylem, separated 

 by medullary rays. The pith is composed of thick-walled cells and 

 some of these contain small clusters of acicular crystals of oxalate 

 of lime. 



Woody. — The middle tissue of the mesophyll composed of large 

 colourless polygonal cells with water-storage function. Neither sur- 

 face of the leaf grooved. Axis not furrowed. Assimilatory tissue 

 of the axis composed of short palisade cells. Sclerenchymatous 

 pericycle in the form of a few scattered bast fibres. Vascular ring 

 broad with vessels uniformly distributed in incomplete rows and 

 more numerous in the lower half. 



Farsetia macrantha Blatt and Hall, Flos. 4, 7, 8.Herbaceous.— 

 Middle tissue of the mesophyll composed of chlorophyll containing 

 horizontally elongated cells with assimilatory function. Lower sur- 

 face of the leaf characterised by ridges and furrows. Axis furrowed. 

 Assimilatory tissue of the axis formed of an outer portion of palisade 

 cells and of an inner portion of chlorenchyma. Sclerenchymatous 

 pericycle in the form of closely placed large groups of bast fibres. 

 Vascular ring undulate and composed of small vascular bundles 

 connected by narrow strands of interfascicular wood prosenchyma 

 with cells resembling stone cells. 



Structure of the Leaf. 

 Epidermis consists of horizontally tabular cells with outer walls 

 greatly thickened and arched convexly outwards. Lateral walls are 

 undulate. Stomata occur on both the surfaces and are accompanied 

 by subsidiary cells one of which is smaller than the other two. The 

 front cavity is placed in a depression formed by outer thickened 

 walls of the epidermal cells. Guard cells are placed in the plane 

 of the surrounding cells. (Fig. 5.) Stomata on the axis are numerous 

 and have the same characters as those on the leaf. Mesophyll is 

 isobilateral, and is characterised by a middle tissue which is composed 

 of large thin-walled colourless polygonal cells, perhaps acting as 

 water reservoirs in F. jacquemontii (Fig. 3) and of horizontally elong- 

 ated green cells in F. macrantha (Fig. 7.) Internal secretary organs 



