W. Nrilson Jones and INl. Ciievelv Kavneh -217 



F„ (ii). Theoretical. 



ft' (a plant) X Ff (/■', plant) 



IF/ : 1// 



Experimental. The results of tliis cross are shown in Table VII. 



TABLE VII. 



10 bunilles H— 13 bundles 14 liuiuUes 



.10 8 1 



No. of plants 



■ 10 



F., (h). Theoretical. 



Ff(F, plant) x Ff{Fi plant) 



I 



I I I 



IFF : 2Ff : Iff 



3 



Experimental. This cross gave plants with anatomy as shown in 

 Table VIII. 



TABLE VIII. 



10 bundles 11—13 bundles 14 bundles 



(9 27 2 



No. of plants ■! " ^- ■ — -'' 



(9 : 29 



The two $ plants which were used as seed parents for F.^ both had 

 the typical 7+7 arrangement of bundles. 



D. Habit and foliage. 



The foliage of White Bryony is notoriously polymorphic, and much 

 variation occurs on any one plant with regard to shape and incision 

 of the leaves. 



In spite of this considerable individual variation the two "varieties" 

 under discussion have habit and foliage so unlike that they may be 

 recognised at a glance. (Plate XXXI, figs. 1, 2.) 



In the F., generation obtained subsequent to crossing so many com- 

 binations occur that, with the number of plants at our disposal, it is 

 impossible to say more than that segi-egation undoubtedly takes 

 place. 



