LIBRARY 

 NEW \ 

 'T IA p BOTANICAL 



OAkDfciN 



journal of Indian Botanp. 



Vol. II. SEPTEMBER, 1921. Nos. 3 & 9. 



THE PHYSIOLOGICAL ANATOMY OF THE 

 PLANTS OF THE INDIAN DESERT 



BY 



T. S. Sabnis, B.A., M.SC, 



St. Xavier's College, Bombay. 

 (Continued from p. 167). 



CYPERAC EAE— (Contd.) 



Scirpus maritimus L— Figs. 311, 312, 313, 314, 315, 316, 



317. Margins pointed and protected by stereome bundles. Stomata 

 on both the surfaces of the leaf-blade with the front cavity depressed. 

 Stomata on the leaf-sheaths on the outer side only. Mesophyll in 

 the leaf-blade wholly of palisade cells on either side of stereome gir- 

 ders. Lysigenous cavities alternating with the veins in the leaf-blade 

 and leaf-sheath. Veins in the leaf-blade vertically transcurrent above 

 and below by aqueous cells. Articulation tissue not developed except 

 for aqueous cells on either side of the veins. Mechanical tissue in 

 the leaf-blade forming I-girders, webs being formed by unmixed 

 vascular bundles ; and that in the leaf-sheath in the form of isolated 

 sub-epidermal girders on the outer side above the veins. Veins enclosed 

 in an outer ring of large polygonal colourless cells and of an inner 

 ring of stone-cells. T. S. of the axis triangular. Assimilatory tissue 

 in the axis of palisade cells between stereome girders. Vascular 

 bundles enclosed in rings of stereome. Peripheral bundles apposed to 

 the stereome girders. Mechanical tissue in the form of isolated sub- 

 epidermal girders, those at the angles forming composite large strands. 

 Ground tissue not differentiated in the centre into pith and of cells 

 with granular contents. 



Structure of the leaf. — The epidermis consists of cells with 

 outer walls flat, greatly thickened and silicified. Inner walls are 

 angular and fit into the sub-epidermal tissue so as to form a com- 



