THE STAMENS. 



81 



Pollen-grains display a great variety of shapes. 

 Besides the round and oblong (Figs. 135 and 136), 

 you will find them angular, lobed, and joined to- 

 gether in various ways (compound pollen) by threes, 

 fours, and even larger numbers (Fig. 132). 



Look at the various forms of pollen pictured upon 

 the charts. 



Examine the pollen of flowers with your magni- 

 fying-glass, and note the shape of the grains, and the 

 kind of surface they present. Observe the moistened 

 pollen of various plants under the microscope. 



EXERCISE XXV. 

 Forms of Connective. 



FIG. 187. FIG. 138. 



FIG. 139, 



FIG, 140. 



FIG. 141. 



Appendicular. 



Connective, widened. 



