THE ESSENTIAL ORGANS OF PLANTS. 87 



Find these several modes of attachment on the charts. 

 Determine and describe the mode of attachment in each 

 of your living specimens. 



EXERCISE XXXV. 

 .Forms of Filaments. 



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

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



2 39)- 



SUBULATE filaments taper like an awl (Fig. 247). 



CAPILLARY filaments are hair-like, and too slender to 

 support the anther (Fig. 248). 



DILATED filaments are flattened out like Fig. 249. 



PETALOID filaments resemble petals in form, and bear 

 the anther at the summit, as seen in Figs. 250 and 251. 



FIG. 247. 

 Subulate. 



FIG. 248, 

 Capillary 



FIG. 249. 

 Dilated. 



FIG. 253. 

 Bidentate. 



BIDENTATE, or BICUSPID, filaments are toothed at the 

 summit or at the base, as seen in Figs. 252 and 253. 



Find examples of the several kinds of filaments upon 

 the charts. Describe the different forms of filaments in 

 your collection of plants. 



