ESSENTIAL ORGAXS. THE PISTIL. 



209 



cylindrical prolongation, 2, forming the style, and a terminal expansion, 

 s, the stigma. It will be seen that in this case two carpellary leaves 

 have become succulent and have united together, so as to form a com- 

 pound pistil, with a single cavity containing one young seed. 



431. The ovary then represents the limb or lamina of the leaf, and 

 is composed of cellular tissue with fibro-vascular bundles, and an 

 epidermal covering. The cellular tissue, or parenchyma, often be- 

 comes much developed, as will be seen particularly when fleshy fruits 

 are considered. The outer epidermis corresponds to the lower side of 

 the leaf, exhibiting stomata, and sometimes hairs ; the inner surface 

 represents the upper side of the leaf, being usually very delicate and 

 pale, and forming a layer called sometimes epithelium (ivl, upon, and 

 dfav;, tender), which does not exhibit stomata. The vascular bundles 

 correspond with the veins of the leaf, and consist of spiral, annular, 

 and other vessels. 



432. The Style has usually a cylindrical form, consists of cellular 

 and vascular tissue, and when carefully examined is found to be 

 traversed by a narrow canal (fig. 373 c), in which there are some 

 loose projecting cells (figs. 374, 375), forming what is called the con- 



ducting tissue. A transverse section of the style of Crown Imperial 

 (fig. 374), shows three vascular bundles, v v v, corresponding to three 

 styles which are united into one, and, p, loose cells in the canal of the 

 style. This canal is bounded by cellular tissue (fig. 375 c c) traversed by 

 spiral vessels, v v, and in its ulterior, besides the loose cells, pp, there are, 



Fig. 374. Transverse section of the style of Fritillaria imperially or Crown Imperial The 

 style is composed of three united together, vvv, Three vascular bundles, each corresponding 

 to one of the three styles, p, Papillae or cellular bodies projecting into the cavity of the canal 



Fig. 375. Structure of the canal in the centre of the style of a Campanula, c c, Cellular tis- 

 sue forming its parietes traversed by tracheae, v. p p, Variously formed cells, displaced as it 

 were, and along with other elongated and filamentous ones, //, obstructing the canal 



