244 " Witches' Broom/' [july, 



broom." These clusters grow perfectly erect from a swollen portion 

 of the normal horizontal branch from which they originate ; the 

 leaves produced on such diseased branches are very small, pale 

 yellow, and only live for one season, falling in the autumn of 



" Witches' Broom " Fungus on Stitchwort and on Mouse-Ear 

 Chickweed. 



each year. The fruit of the fungus is borne on these stunted 

 leaves. 



JJ^The second stage of the fungus, which has been quite recently 

 indicated by Professor Eduard Fischer, of Berne, grows on 

 several different kinds of small weeds belonging to the pink or 



