78 



THE SECOND BOOK OF BOTANY. 



EXERCISE XXIII. 

 Forms of Filaments. 



FIG. 122; 



FIG. 123. 



FIG. 124. 



Filiform. 



Sub-ulate. 



Capillary. 



FILIFORM filaments are thread-like, as the name de- 

 notes, but strong enough to support the anther (Fig. 

 122). 



SUB-TIL ATE filaments taper like an awl (Fig. 123). 



CAPILLARY filaments are hair-like, and too slender 

 to support the anther (Fig. 124). 



DILATED filaments are flattened out like Fig. 126. 



PETALOID filaments resemble petals in form, and 

 bear the anther at the summit, as seen in Figs. 127 

 and 128. 



BI-DENTATE, or Bi-cuspiD, filaments are toothed at 

 the summit or at the base, as seen in Figs. 129 and 130. 



Find examples of the several kinds of filaments 

 upon the charts. Describe the different forms of 

 filaments in your collection of plants. 



