170 



SUBMERGED LEAVES 



[CH. 



FIG. no. Trichomes ol Myriophyllum verticillatum, L. A , diagram of a young leaf 



showing the arrangement of the trichomes. B, a single multicellular caducous 



trichome at leaf margin with corky cells, c, at its base. [Perrot, . (190)-] 



, 



FIG. in. Callitriche verna, L. A, T.S. submerged leaf, x 80; B, T.S. leaf of 

 land form, x 147; C, upper epidermis of submerged leaf, x 92; D, upper epi- 

 dermis of land leaf, x 88; E, lower epidermis of submerged leaf, x 92; F, lower 

 epidermis of land leaf, x 88. [Schenck, H. (1886).] 



