xiv LIST OF ILLUSTRATIONS 



FIG. PAGE 



96. Hippuris vulgaris, L. A case of air leaves followed by water leaves. 



[A. A.] ... .148 



97. Sium latifolium, L. Heterophylly. [A. A.] 149 



98. Sium latifolium, L. Submerged leaf. [A. A.] . . . .150 



99. Polygonum amphibium^L. Water and land forms. [Massart, J. (1910)] 152 



100. Polygonum amphibium, L. Epidermis of water and land leaves. 



[Massart, J. (1910)] 152 



101. Alisma Plantago, L. Seedlings. [A. A.] 153 



102. Alisma Plantago, L. Water form. [A. A.] 153 



103. Potamogeton natans, L. Effect of transferring land plant to water. 



[Goebel, K. (1891-1893)] . 154 



104. Potamogeton fluitans, Roth. Effect of poor nutrition in water upon 



a land plant. [Esenbeck, E. (1914)] 158 



105. Potamogeton natans, L. Effect of growth as a cutting. [Esenbeck, E. 



(1914)] . . 159 



106. Elodea canadensis, Michx. Leaf anatomy. [Schenck, H. (1886)] . 165 



107. Submerged stomates of Callapalustris, L. and Potamogeton natans, L. 



[Porsch, O. (1905)] 167 



108. Potamogeton densus, L. Leaf apex. [Sauvageau, C. (I89I 1 )] . . 167 



109. Myriopbyllum spicatum, L. Leaf anatomy. [Schenck, H. (1886)] . 168 

 no. Myriopbyllum verticillatum, L. Trichomes. [Perrot, iL (1900)] . 170 

 in. Callitricbe verna, L. Leaf anatomy of land and water forms. 



[Schenck, H. (1886)] . 170 



112. Hippuris vulgaris, L. Rhizome. [Irmisch, T. (1854)] . . . 173 



113. Ranunculus trichopbyllus, Chaix. Stem anatomy. [A. A.] . . 176 



114. Callitriche stagnalis, Scop. Stem stele of land and water forms. 



[Schenck, H. (1886)] ... . . . 176 



115. Hippuris vulgaris, L. Relation of cauline and leaf trace xylem. 



[A. A.] 178 



116. Myriopbyllum spicatum, L. Stem anatomy. [Vochting, H. (1872)] 179 



117. Myriophyllum spicatum, L. Details of stem anatomy. [Vochting, H. 



(1872)] . "... 179 



n8. Potamogeton natans , L. Diaphragm of stem. [Blanc, M. le (1912)] . 184 



119. Hippuris vulgaris, L. Development of stem diaphragms. [A. A.] . 184 



1 20. Hippuris vulgaris, L. Origin of cortical lacunae in stem. [Barratt, K. 



(I9 l6 )] - 185 



121. Stratiotes aloides, L. Origin of cortical lacunae in root. [Arber, A. 



(1914)] . . 186 



122. Jussiaea peruviana, L. Aerenchyma. [Schenck, H. (1889)] . . 190 



123. Neptunia oleracea, Lour. Floating shoot. [Rosanoff, S. (1871)] . 191 



124. Nesaea verticillata, H. B. & K. Floating tissue. [Schrenk, J. (1889)] 193 



125. Potamogeton natans, L. Land form. [A. A.] .... 196 



