HOW PLANTS OBTAIN FOOD. 89 



ing nutriment may be demonstrated by making sections through 

 both parasite and host at a point where the haustoria enter the 

 stem. These should then be mounted for examination with 

 the microscope. 



Fig. 64. 

 Several teleutospores, showing the variations in form. 



161. Carnivorous plants, or insectivorous plants, Examples 

 of these are the well-known Venus fly-trap (Dionaea muscipula) 

 and the sundew (Drosera rotundifolia). These are illustrated 

 in figures 67 and 68. The lamina of the leaf of the Venus 



Cell- 



Fig. 65. 



from the stem of a rusted carnation, showing the intercellular mycelium and haus- 

 toria. Object magnified thirty times more than the scale. 



fly-trap resembles a steel trap, as shown open in figure 67. 

 When an insect alights on the leaf and touches one of the hairs 

 (there are three prominent hairs on the upper surface of each 



