398 



UTEICULARIA NEGLECTA. 



Chap. XVIL 



The bladders are filled with water. They generally, 

 but by no means always, contain bubbles of air. Ac- 

 cording to the quantity of the contained water and 

 air, they vary much in thickness, but are always some- 

 what compressed. At an early stage of growth, the 

 flat or ventral surface faces the axis or stem ; but the 

 footstalks must have some power of movement ; for 

 in plants kept in my greenhouse the ventral surface 

 was generally turned either straight or obliquely 

 downwards. The Kev. H. M. Wilkinson examined 



Fig. is. 



( Utricularia neglecta.) 



Bladder ; much enlarged, c, collar indistinctly seen through the walls. 



plants for me in a state of nature, and found this 

 commonly to be the case, but the younger bladders 

 often had their valves turned upwards. 



The general appearance of a bladder viewed late- 

 rally, with the appendages on the near side alone 

 represented, is sho^vn in the accompanying figure 

 (fig. 18). The lower side, where the footstalk arises, is 

 nearly straight, and I have called it the ventral surface. 

 The other or dorsal surface is convex, and •terminates 

 in two long prolongations, formed of several rows of 

 cells, containing chlorophyll, and bearing, chiefly on 



