THE SPERMATOPHYTES 473 
lobes called microsori. Each lobe or microsorus contains two 
anther sacs or microsporangia in which, when mature, are to be 
found microspores or pollen grains. . In the center of the flower will 
be noted the gynoecium or female system of organs. This, upon 
dissection, will be found to consist of three fused carpellary leaves 
termed megasporophylls (carpels) forming a somewhat flask- 
shaped structure called a pistil. "The swollen basal portion of the 
Fic. 356.—Cross section of the ovary of a lily formed by the coalescence of the 
lower portions of three carpels. X70. 5, dorsal sutures; ep, epidermis; c, cuticle of 
epidermis; / bundle in mesophyll; /, locule; ov, ovule (anatropous); p/, infolded edges 
of adjacent carpellary leaves forming the axile placentas from which the ovules arise. 
pistil is called the ovary; the stalk which arises from it is called the 
style and the knob-like viscid summit of the style is termed 
the stigma. 
Microscopical examination of sections of the ovary will reveal 
it to be composed of three chambers called Jocules, within each of 
which are to be noted several inverted ovules. Each of these 
ovules is developed upon a nourishing tissue termed “placenta” 
which connects the ovules to the inner angle of the wall of the 
locule. The ovule is composed of a central prominent mega- 
