io 
OF THE BRACKEN IN RELATION TO ENVIRONMENT. 667 
whether the leaf shall be xerophy 
apply to other plastic species. 
Fig. 3 is from a photograph of a leaf which was produced by 
the plant in the greenhouse. 
tic or not; and the same may 
Fig. 4, 
: 
Mt 
Leaf from same plant grown out of doors. { nat. size. 
Towards the end of 1902 the plant was put out of doors once 
more, and during 1903 it produced only leaves of a xerophytic or 
half-xerophytic type. Fig. 4 is one of the earlier of these leaves 
(about the fourth leaf put up). In habit it is one of the dwarf, 
