•24 



JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



with the contents retracted at each end, oozing out when mature in pale 

 rosy tendrils (16-17 ^ long). 



The same disease is credited with attacking Figs when approaching 

 maturity, although some writers have suggested that the species which 

 attacks Figs is the same as that which attacks Apples and Grapes 

 (GUvosporium fructigenum). The difference between them is mainly 

 in the size of the conidia, whilst the precautions and remedies remain the 

 same. 



All the species of " Anthracnose," as they are termed in America, 

 are dreadfully injurious, and are recognised as the most persistent of 

 pests. 



Sacc. Syll. iii. 3753 ; Gard. Chron. 1859, p. 604, and December 6, 

 1890 ; Cooke Hdbk. No. 1110 ; Thiim. Pom. p. 57. 



Peach Rust. 

 Uromyces amygdali (Pass.), PL XL fig. 21. 



We confess to being incorrigibly heretic on many points in connection 

 with the rust fungi, and this one in particular. 



When the rust on the Peach leaves was first submitted to us we 

 declined to regard it as any form of Puccinia pruni, and accepted the 

 name given by Passerini of Uromyces amygdali. We are concerned with 

 the rust of Peach leaves and not now with the usual form on the leaves 

 of Plum, and it is our pleasure to treat them as distinct diseases. 



The underside of Peach leaves is liable to be affected with a rust the 

 pustules of which are small and numerous. The cuticle is soon split, and 

 the spores scattered as a fine rust-coloured dust. The form of these 

 spores is quite unusual for those of a uredo, but approaching the type 

 which is common in the teleutospores of Uromyces. They are consider- 

 ably elongated, swollen in the middle, and almost bluntly lance-shaped, 

 quite smooth externally, with the coat of the spore considerably 

 thickened at the apex, and continued at the base into a rather short thick 

 pedicel (35-40 x 12 /*). In fact, except to a uredomaniac, more like the 

 teleutospores of Uromyces than the uredospores of Puccinia. 



Latterly the specialists of a special kind have been driven to the 

 alternative of suggesting that there must be two kinds of uredospores 

 associated with Puccinia pruni, and that this is " the other one." 



This rust is more common in the United States than it is with us, 

 bat it is found also in Southern Europe and in Australia. 



Oooke in Bav. Fungi Exsicc. ; Cooke Hdbk. Austr. Fungi, No. 

 17:;i. 



Peach-leaf Blister. 

 Exoascus deformans (Berk.), PL XI. fig. 23. 



Peach -leaf blister is such a common affection that a description is 

 00 re* 1 y necessary. Sometimes aphides or other small creatures may 

 produce somewhat similar appearances, but the real Peach blister is an 

 established fact. 



The leaves arc polled up, blistered, and contorted in a variety of ways, 



