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 



Prunus Padus Oak Euonymus 



Apple Willows Elms 



Lime Beech Ash 



Cherry Birch Hazel 



Pear Mulberry 



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 with readiness from the un- 

 injured roots of still standing trees or shrubs in : 



Poplars Hawthorn 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 Pear 



Horse-chestnut Planes Apple 



Pyrus torminalis Pyrus Aria Raspberry 



Alder Prunus Padus 



