365 



MY GARDEN. 



of May in Devonshire, and in my garden at the beginning of June ; 

 it increased throughout the summer, and in September the trees 

 were in a terrible state. 



Our cabbages, cauliflowers, shepherd's purse, and other similar plants, 

 are sometimes attacked with spots of white rust (Cystopus Candidas, 

 fig. 851) on the leaves, arranged in a circular .manner. The mycelium 



Zoospore. 



FIG. 850. Coleosporium p'ngue, 

 nat. size and magnified. 



FIG. 851. Cystopus Candidas, 

 nai. size and magnified. 



creeps through the cellular tissue of the plants, and after a time gives 

 rise to zoospores or moving bodies to perpetuate the species. I 

 believe that in all these cases the plant is previously pierced by 

 an aphis. 



Our sweet-williams are frequently attacked on the under-surface 

 of the leaf with' pale yellow spots, which is a fungus called the 



FIG. 52. Puccinia lychnidearum, 

 nat. size and magnified. 



FIG. 853. Helminthpsporium 

 pyrorum (x 700 diam.). 



FIG. 854 Siberian Cra 

 Fungus (x 700 c'.iam.). 



Puccinia lychnidearum (fig. 852). This species also attacks other plants, 

 as the Lychnis. 



The fruit-tr^es are subject to the attack of a black fungus, of 

 which we note particularly two species, one the Helminthosporinm 

 pyrorum (fig. 853), which attacks sometimes the Louise Bonne pear, 



