iv] THE FROGBIT 47 



be found, however, in Continental stations ; dehiscence is said to 

 be brought about through the pressure of a slimy mucilaginous 

 mass produced from the testas 1 . As in so many water plants, 

 vegetative reproduction is the chief method of continuance 

 of the species; it occurs by means of winter buds or ' turions,' 

 which in the late summer begin to replace the ordinary 

 buds (Fig. 29). The turions differ from the leaf-buds, which 



FIG. 29. Hydrocharis Morsus-ranae, L. Part of plant, October i, 1910, showing 

 turions, marked solid black. (Reduced.) [A. A.] 



precede them throughout the spring and early summer, in the 

 fact that the two first scale leaves do not unfold, but firmly 

 enwrap the succeeding leaves, while the roots, instead of being 

 developed at once, remain within the axis as rudiments. The 



1 Goebel, K. (1891-1893). 



