226 THE " SHOT-HOLE " FUNGI OF STONE-FRUIT TREES, 



ultimately dropped out. I have not met with any pycnidial 

 stage of this fungus, and the life-histoiy stages at present known 

 ■are as follows : — 



1. Conidial stage (Ascoclnjta). 



2. Ascidial or highest stage (Gnomonia). 



In an allied species found on Cherry-leaves ( G. enjtlirostoma) 

 the pycnidial stage is referred to a species of Sejytoria. 



ExMhasidium vlfis. — While investigating the cause of shot- 

 hole in Apricot leaves from a dry district such as Ardmona during 

 the month of October, it was found to be quite different from 

 that in the neighbourhood of Melbourne. In my own garden at 

 that season of the year there was abundance of Clasterosporium 

 amy <j dale arum producing " shot-hole " in Apricot leaves, but that 

 fungus has never been found in the Ardmona district. Instead 

 of that, white patches occur on the brown spots of the leaves, and 

 on microscopic examination these turned out to be the same as 

 those p]?eviously found on the Vine in the same district and con- 

 sisted of Exohasidium vitis. 



This fungus has already been described for Australia in my 

 "Additions to the Fungi on the Vine," and the disease caused by 

 it was first observed there in February, 1895. In the intei-val 

 this fungus has evidently spread fi-om the Vine to the leaves of 

 the Apricot, Peach and Plum, but while in the Vine leaves it 

 causes patches to become red or brown, in the leaves of stone- 

 fruit trees it produces actual '- shot-hole." 



The occurrence of this fungus in association with the shot-hole 

 •of stone-fruit trees is interesting in many w^ays, and adds another 

 to the numerous fungi producing such effects. 



It has been pointed out by various writers that there is some 

 peculiarity^ about the leaves of stone-fruit trees which renders 

 them liable to be affected in this way, and the present case shows 

 that different leaves are affected by the same fungus in different 

 ways. 



JPhyllosficta persicce, (including P. circumsclssa). — In an}" list 

 of " shot-hole " fungi for Australia it may seem rather strange 

 that Fhyllosticta circumscissa is not mentioned, which is regarded 



