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NOTES ON UROMYCES AMYGDALI, COOKE, 
Iii order to make sure that we were dealing with the same 
fungus, I have examined peach leaves with the fungus named by 
Cooke himself in the Herbarium of the Government Botanist, 
and there is no doubt as to the identity of the specimens. 
Further, Mr. Tryon has very courteously sent me specimens of 
peach leaves similar to those formerly submitted to Dr. Cooke, 
and on which the name was based, with this important difference, 
however, that the original specimens were collected in February, 
while these are dated J une. 
In addition to this, specimens on peach, plum, apricot and 
almond leaves had been sent from South Australia to the United 
States Division of Vegetable Pathology, and it was reported in 
the Journal of Mycology for 1890 that these specimens agree in 
every particular with those of Puccinia pruni, Pers., on peach 
and plum hosts in the United States, nevertheless his own name 
was still retained by Dr. Cooke. 
As the leaf-rust is unfortunately becoming, or rather has 
become, very prevalent and a very serious pest to the fruit- 
grower, it is at least advisable to agree upon some common name, 
to have uniformity of nomenclature in the different Colonies, so 
that when dealing with it therapeutically we may be agreed as to 
the cause of the disease dealt with. And not only so, but the 
name here has an important bearing when it enables us to 
recognise the useful fact that the rust in our orchards and the 
rust in our wheat-fields are but different species of the same 
genus ( Puccinia ), and that whatever prevents the disease in the 
one case is likely to be efficient in the other. 
A further necessity exists for accurate scientific determination 
of this fungus from the fact that it is very commonly called 
" Peach Yellows " on account of the yellow blotches or freckles on 
the upper surface of the leaf, but it has no connection with the 
dreaded American disease so-called, which is believed to be, after- 
years of investigation, due to Bacteria. 
In the plum the spots assume a much darker colour, and the 
numerous pustules on the undersurface of the leaf sometimes 
give it the appearance of being coated with brown mud. 
