io 4 UTRICULARIA [CH. 



attribute to stems alone, viz. long continued apical growth 1 , 

 as well as power of bearing leaves and axillary branches and of 

 developing in more than one plane 2 . The fact that adventitious 

 shoots are produced on the leaves of other Lentibulariaceae is, 

 however, favourable to this view 3 . The unique pla'sticity of the 

 Utricularias is indicated by the many observations on regenera- 

 tion phenomena in the genus, which show that almost any part 



FIG. 70. Utricularia vulgaris, L. Detached leaf with four adventitious shoots, 

 A, A lf A z , A 3 . (Enlarged.) [Goebel, K. (1904).] 



of these plants can produce new shoots at will. For instance, 

 in U. neglecta^ detached leaves, or leaves connected with a dying 

 axis, can produce adventitious shoots which arise endogenously 

 at the points of forking of the leaves, or, more rarely, from the 

 stalks of the bladders 4 . Fig. 70 represents a case in which four 



1 Hovelacque, M. (1888). 2 Goebel, K. (1891). 



3 Goebel, K. (1904). 4 Gluck, H. (1906). 



