62 



STOOL-SHOOTS, SUCKERS 



[CH. 



pre-formed or dormant structures. Each such bud as it is 

 developed at once breaks through the outer covering layers 

 of dead cells and cork formed over the callus, and grows 

 forthwith to a new shoot. 



It will be noticed that in a true dormant bud the pith 

 is continuous with the pith of the branch bearing it : a 

 practical distinction between such and true adventitious 

 buds is that this is not the case in the latter. 



Stool-shoots are readily developed by : 



Poplars Robinia Hornbeam 



Horse-chestnut Alder Chestnut 



Oak Euonymus 



Willows Elms 



Beech Ash 



Birch Hazel 

 Mulberry 



Primus Padus 

 Apple 

 Lime 

 Cherry 

 Pear " 



The case of true suckers is very similar, the principal 

 differences being that the buds are developed in the 

 deeper tissues of the root, and that injuries are not always 

 necessary for their inceptive stimulus. 



Suckers are developed w-ith readiness from the un- 

 injured roots of still standing trees or shrubs in : 



Poplars Ha-wthorn Euonymus 



Dogwood Ailanthus Blackthorn 



Rowan Privet Robinia 

 Tulip-tree 



In the following, suckers frequently follow injuries to 

 the tree, or to its roots: 



Elms Cherry 



Horse-chestnut Planes 



Pyrus torminalis Pyrus Aria 



Spircea Alder 



Pear 

 Apple 

 Raspberry 

 Printus Padus 



