THE 



journal of India 



Vol. II. JULY, 1921. Nos. 6 & 7. 



THE PHYSIOLOGICAL ANATOMY OF THE 

 PLANTS OF THE INDIAN DESERT 



BY LIBRAE 



T. S. Sabnis, B.A., M.Sc. new , 



(Continued from p. 107). BOTa/\ 



CHENOPODIACEAE.— (Contd.) 



Salsola foetida Del— Figs. 287, 289, 290. Leaf suborbicular 

 and fleshy. Stomata depressed. Aqueous tissue subepidermal. Pali- 

 sade tissue forming a continuous ring. Clustered crystals in subepi- 

 dermal and central aqueous tissue. Veins peripheral and central. 

 Central veins embedded in a cylinder of stone-cells. ColJenchyma 

 below epidermis of the axis. Cortical parenchyma forming an aque- 

 ous tissue. Pericycle of small isolated groups of stone-cells. Vascular 

 bundles in the axis embedded in interfascicular wood prosenchyma 

 and forming a hollow cylinder. Pith of thin- walled large cells. 



Structure of the Leaf— Epidermal cells in S. foetida have outer 

 walls papillose and they are of two sizes, larger ones bearing hairs. 

 Epidermal cells in H. recurvum have outer walls convexly arched 

 outwards. Outer walls are not much thickened in any of the members. 

 The guard-cells are usually placed in the plane of surrounding 

 cells, though in H. recurvum they are sometimes distinctly situated 

 below the plane of epidermal cells. Stomata are surrounded by ordi- 

 nary epidermal cells and the front cavity is closed by outer horns of 

 the guard-cells. 



Mesophyll is differentiated into assimilatory and aqueous tissue. 



The assimilatory tissue in S. foetida consists of a continuous ring of 



palisade cells. Palisade cells in H. recurvum form a continuous layer, 



*— broken at the angles, in portions of the leaf towards the apex ; but as 



^ we proceed examining sections from the apex to the base of the leaf 



" the palisade tissue is seen to disappear also at the middle of the flat 



CO 



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