398 



UTKICULARIA NEGLECTA. 



CHAP. XVII 



The bladders are rilled 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 ruy greenhouse the ventral surface 

 was generally turned either straight or obliquely 

 downwards. The Kev. H. M. Wilkinson examined 



FlQ. 18. 



( Utricularia neglecta.) 

 Bladder j 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. 



Tho general appearance of a bladder viewed late- 

 rally, with the appendages on the near side alone 

 represented, is shown 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 Ions: prolongations, formed of several rows of 

 trells, containing chlorophyll, and bearing, chiefly on 



