344 



UTRICULARIA NEGLECTA. [Chap. XVII. 



One branch extends up the middle of the dorsal surface, and 

 the other up the middle of the ventral surface. In full- 

 grown bladders the ventral bundle divides close beneath the 

 collar, and the two branches run on each side to near where 

 the comers of the valve unite with the collar; but these 

 branches could not be seen in very young bladders. 



The accompanying figure (Fig. 23) shows a section, which 

 happened to be strictly medial, through the footstalk and 

 between the nascent antennse of a bladder of Utricularia vul- 

 garis, T^T inch in diameter. The specimen was soft, and the 

 young valve became separated from the collar to a greater de- 

 gree than is natural, and is thus repre- 

 sented. We here clearly see that the 

 valve and collar are infolded pro- 

 longations of the wall of the bladder. 

 Even at this early age, glands could 

 be detected on the valve. The state 

 of the quadrifid processes will pres- 

 ently be described. The antenna? at 

 this period consist of minute cellular 

 projections (not shown in the accom- 

 panying figure, as they do not lie in 

 the medial plane), which soon bear 

 incipient bristles. In five instances 

 the young antennae were not of quite 

 equal length; and this fact is intelli- 

 gible if I am right in believing that 

 they represent two divisions of the 

 leaf, rising from the end of the blad- 

 der; for, with the true leaves, whilst very young, the divi- 

 sions are never, as far as I have seen, strictly opposite ; they 

 must therefore be developed one after the other, and so it 

 would be with the two antenna?. 



At a much earlier age, when the half-formed bladders are 

 only rhr inch (.0846 mm.) in diameter or a little more, they 

 present a totally different appearance. One is represented on 

 the left side of the drawing on the opposite page (Fig. 24). 

 The young leaves at this age have broad flattened segments, 

 with their future divisions represented by prominences, 

 one of which is shown on the right side. Now, in a large 

 number of specimens examined by my son, the young blad- 



FlG. 23. 

 ( Utriadaria mdgaris.) 

 Longitudinal section 

 through a young blad- 

 der, TOO of an inch in 

 length, with the orifice 

 too widely open. 



