THE GENOTYPICAL RESPONSE OF THE PLANT 217 
plant from the woods. The latter has somewhat larger leaves than the 
former; they are further convexly bent and of a deep green colour in 
the woods, while the leaves of the pasture plant are somewhat concave 
and light green in colour. 
The separate plants of the pasture series cannot be seen to differ 
from each other in culture. The series from the Kivik woods, in all 
16 individuals, cultivated at the side of the former does not show any 
Fig. 1. Lysimachia nummularia, Forest type (the upper) and pasture type. 
observable variation within the series either. It is a remarkable fact 
that the Kivik nummularia retains its distinctive marks in culture. 
The small pieces of turf originally brought home have increased in size 
ten-fold without showing any tendency to lose their characteristics. 
Clones raised in 1922 from cuttings from both the pasture and the 
forest nummularia likewise retain the characteristics of the respective 
mother plants. Fig. 1 represents pieces of the two plants taken from 
the clone cultures in 1922. The differences between the pasture plant 
and the plant of the woods as to the leaves are at once seen. Cross 
